Answer:
True
Explanation:
Wind is the most efficient fuel for electricity. It creates 1164% of its original energy inputs when converted into electricity, unlike coal which retains just 29% of its original energy.
It is also environmental and eco-friendly.
Answer:
TRue
Explanation:
Environmental Impacts Assessments of wind power projects, when compared to Impact Assessments of different power projects, have shown that impacts from wind power is small when compared to that of fossil fuel power. The global warming potential of wind power per unit of energy produced is far lower than that of other power sources.
This renewable energy source has been seen to be the most efficient fuel for electricity, which generates over 1164% of the initial energy inputs when converted into electricity.
As you hike from the highest elevation to the lowest elevation, you find three different species of related mice. None of them are found at the same elevation, and the vegetation changes at each elevation level.Using species C as a reference, you find that there are more genetic differences between species A and species C than between species A and species B. Which of the following statements would best reflect the mode of speciation in these mice?-Speciation was allopatric or peripatric, but would depend on the number of individuals that dispersed from the original population.-Only genetic drift is responsible for the differences observed.-Species C arose from species A later than species B.speciation was allopatric or peripatric, but would depend on the number of individuals that dispersed from the original populations.
Answer:
Speciation was allopatric or peripatric, but would depend on the number of individuals that dispersed from the original populations.
Explanation:
The new species can be formed in one of the three ways that are allopatric, peripatric, and parapatric speciation.
The allopatric speciation gives rise to new species due to the geographical barriers present between them and the peripatric speciation occurs when a small population enters into a new habitat.
In the given question, species A is more closely related to species B as to species C. This could be due to the allopatric speciation or peripatric speciation but it would depend on the number of the individuals of the population that dispersed to a different elevation which provided a new niche.
Thus, the selected option is correct.
The defining characteristics of active transport are that this category of transport moves substances _________ their concentration gradient and requires ___________.
Answer:
Against; energy.Explanation:
1. Active transport is the transport of molecules, in that the particles move across a membrane from a region of lower concentration to a the region of higher concentration with the help of energy.
2. Active transport is the energy-requiring process and results in the transportation of molecules and ions across membrane against a gradient called uphill transport.
3. Example: The Sodium-Potassium pump.
Why can't viruses effect non-livng things?
Answer:they need an active host
Explanation:
Answer:
Viruses need a host to survive.
Explanation:
They are categorized under parasitism to the host.
Regular aerobic exercise training affects carbohydrate (CHO) usage by ____. Select one: a. increasing the enzymatic activity associated with glycolysis b. increasing the number and size of mitochondria c. decreasing liver glycogen storage so more CHO is stored as muscle glycogen d. decreasing the oxidative capacity of muscle
Answer:
Option B, increasing the number and size of mitochondria
Explanation:
Mitochondria (power house of a cell) produce energy. When no exercise is done, the productivity of mitochondria reduces but it increases with regular exercise. In fact aerobic training helps mitochondria in making more energy by enhancing its efficiency. With one cycle of exercise, mitochondria produce 32 ATPs. Aerobic exercise allows more of oxygen to get to the muscle cells, the faster it happens the more energy is produced
Hence, option B is correct
Answer:
B, increasing the number and size of mitochondria
Explanation:
Evolution of a species could occur as a result of changes in the
Options for the question have not been provided. They are as follows:
(1) DNA in muscle cells
(2) base sequences in liver cells
(3) genes in an egg cell
(4) number of chromosomes in a fetal bone cell
Answer:
(3) genes in an egg cell
Explanation:
Evolution is the change in characteristics of a species which it develops over the time. These changes can be a result of natural selection, genetic drift, founder effect etc. They are passed from one generation to another hence the alleles for them get fixed in the population.
For evolution to occur, change should take place in germ cells. Germ cells are the one which fuse to form the organisms of next generation. If there is a change in their genes, it would also appear in next generation, unlike changes in genes of somatic cells. Since egg cell is a germ cell it is the correct answer.
Answer:
genes in an egg cell
What are some benefits to producing Super Cows?
Answer:
Genetically modified cows produce 'human' milk.
Explanation:
A fossil is discovered that has only 12.5% of the carbon-14 that it would have had originally (when the animal was alive). If the half-life of carbon-14 is 5700 years, approximately how old is the fossil?
Answer:
The fossil is 17,100 years old.
Explanation:
The decay equation:
[tex]\frac{dN}{dt}\propto -N[/tex]
[tex]\Rightarrow \frac{dN}{dt}= -\lambda N[/tex]
[tex]\Rightarrow \frac{dN}{N}= -\lambda dt[/tex]
Integrating both sides
[tex]\Rightarrow \int\frac{dN}{N}= \int-\lambda dt[/tex]
[tex]\Rightarrow ln |N|=-\lambda t+c[/tex]
When t=0, N=[tex]N_0[/tex] = initial amount
[tex]ln |N_0|=-\lambda .0+c[/tex]
[tex]\Rightarrow ln |N_0|=c[/tex]
[tex]\therefore ln |N|=-\lambda t+ln|N_0|[/tex]
[tex]\Rightarrow ln |N|-ln|N_0|=-\lambda t[/tex]
[tex]\Rightarrow ln |\frac {N}{N_0}|=-\lambda t[/tex]
[tex]\Rightarrow \frac {N}{N_0}=e^{-\lambda t}[/tex]
[tex]\Rightarrow N=N_0e^{-\lambda t}[/tex]
The decay equation is
[tex]N=N_0e^{-\lambda t}[/tex]
Given that,
The half life of carbon - 14 is 5700 years.
For half life, [tex]N=\frac{1}{2} N_0[/tex]
To find the value of [tex]\lambda[/tex], we need to put the value of N and t in the decay equation.
[tex]\frac12N_0=N_0e^{-\lambda \times 5700}[/tex]
[tex]\Rightarrow \frac12=e^{-\lambda \times 5700}[/tex] [ Divided [tex]N_0[/tex] both sides]
Taking ln both sides
[tex]\Rightarrow ln| \frac12|=ln|e^{-\lambda \times 5700}|[/tex]
[tex]\Rightarrow ln| \frac12|={-\lambda \times 5700}[/tex]
[tex]\Rightarrow \lambda= \frac{ln| \frac12|}{-5700}[/tex]
[tex]\Rightarrow \lambda= \frac{ln|1|-ln|2|}{-5700}[/tex] [ [tex]ln|\frac mn|= ln |m|-ln |n|[/tex]]
[tex]\Rightarrow \lambda= \frac{ln|2|}{5700}[/tex] [ln 1= 0]
The fossil has only 12.5% of the carbon carbon-14 that it would have had originally.
So, [tex]N=\frac{12.5}{100} N_0[/tex]
Then,
[tex]\frac{12.5}{100} N_0=N_0e^{-\frac{ln|2|}{5700}t[/tex]
[tex]\Rightarrow \frac{12.5}{100} =e^{-\frac{ln|2|}{5700}t[/tex]
Taking ln both sides
[tex]\Rightarrow ln|\frac{12.5}{100} |=ln|e^{-\frac{ln|2|}{5700}t}|[/tex]
[tex]\Rightarrow ln|\frac{12.5}{100} |={-\frac{ln|2|}{5700}t}[/tex]
[tex]\Rightarrow t=\frac{ ln|\frac{12.5}{100}|} {-\frac{ln|2|}{5700}}[/tex]
[tex]\Rightarrow t=\frac{ ln|\frac{12.5}{100}|\times 5700} {-{ln|2|}}[/tex]
[tex]\Rightarrow t=17,100[/tex]
The fossil is 17,100 years old.
What is the structures of carbohydrates?
Answer:
Answered below
Explanation:
Carbohydrates are biomolecules that contain hydrogen, carbon and oxygen. They are generally structured as a chain of carbons with hydroxyl groups, and ketones or aldehydes. The subtypes include;
Monosaccharides
Disaccharides
Polysaccharides
Monosaccharides are generally represented by the formula CH2On. They are classified based on the number of carbon atoms they have. Example, hexoses have 6 carbon atoms, pentose, 5, diose, 2 etc. They are also classified based on whether they have ketones or aldehydes. Examples of monosaccharides are glucose and fructose.
Disaccharides are formed when two monosaccharides form glycosidic bond through a dehydration reaction. Examples of disaccharides include; maltose, lactose, and sucrose which is made up of glucose and fructose. An oligosaccharide is made up of 2-10 monosaccharides and are often components of glycoproteins or glycolipids.
Polysaccharides, also called complex carbohydrates are long-chain carbohydrates made of repeated monosaccharides linked by glycosidic bonds. Examples are starches and glycogen.
Where is the prostate gland located and what is its function
Answer:
Prostate gland is a main organ of reproductive system in male. Its main function is to secretes liquid substances in order to maintain health of sperm.
Explanation:
Prostate gland is present between two main organs of reproductive system i. e. bladder and penis. Its size is small equal to the size of walnut. The main function of prostate gland is to secretes prostate liquid. This liquid is the main part of semen.
Answer:
The prostate gland is just in front of the rectum. The urethra runs through the center of the prostate, from the bladder to the penis, letting urine flow out of the body.The prostate gland is a male reproductive organ whose main function is to secrete prostate fluid, one of the components of semen. The muscles of the prostate gland also help propel this seminal fluid into the urethra during ejaculation.
Explanation:
The prostate, a small muscular gland, produces an important fluid that transports sperm and keeps them safe.The prostate only appears in males. It secretes a fluid that keeps sperm alive and the genetic code they carry.
The prostate contracts and ejaculates its fluid into the urethra. During ejaculation, sperm travels along two tubes called vas deferens, they carry millions of sperm from the testes (where they are made) to the seminal vesicles. The seminal vesicles are attached to the prostate and add extra secretions to the semen before it is sent down the urethra. The prostate contracts during ejaculation, closing off the opening between the bladder and urethra and pushing semen through at speed.
To function properly, the prostate needs androgens (male hormones), such as testosterone and dihydrotestosterone (DHT).
What is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?
A series of reciprocal evolutionary adaptations in two species is called _____.
Answer:
coevolution.
Explanation:
A series of reciprocal evolutionary adaptations in two species is called _____. coevolution.
The chief force pushing water and solutes out of the blood across the filtration membrane is A) the ionic electrochemical gradient B) protein-regulated diffusion C) glomerular hydrostatic pressure D) the size of the pores in the basement membrane of the capillaries
Explanation:
Glomerular filtration is the process which kidneys uses to filter excess fluid and waste products out of the blood into the urine collecting tubules of the kidney, so that they may be eliminated from the bodyThe rate at which kidneys filter blood is called the glomerular filtration rateThe main driving force for the filtering process, or outward pressure is the blood pressure as it enters the glomerulus, this is counteracted to some extent by inward pressure due to the hydrostatic pressure of the fluid within the urinary space, and the pressure generated by the proteins left in the capillaries that tend to pull water back into the circulatory system (colloidal osmotic pressure)The net filtration pressure is the outward pressure minus the inward pressureWhich of these energy transformations is taking place in the kelp as it carries
out photosynthesis?
O
A. Solar energy → Chemical energy
O
B. Potential energy → Kinetic energy
O
C. Chemical energy
Solar energy
O
D. Potential energy → Nuclear energy
SUBMIT
The specific type of energy transformation that takes place during photosynthesis is Solar energy to Chemical energy (Option A).
What is photosynthesis?Photosynthesis is a series of chemical reactions by which plant cells and algae use the energy from the sun (sunlight) to produce simple carbohydrates (i.e., sugars).
Photosynthesis needs oxygen, water (H2O) and sunlight or solar radiation to produce glucose (sugar) and carbon dioxide (CO2).
In conclusion, the specific type of energy transformation that takes place during photosynthesis is Solar energy to Chemical energy (Option A).
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As a seed plant germinates, the new plant is called a(n) after the leaves first open.
Answer: seedling
Explanation: took test got 100%
can you please give brainliest or heart
As a seed plant germinates, the new plant is called a(n) seedling, after the leaves first open.
After the leaves first open, the new plant is termed a "seedling." This phase marks the early stage of growth after germination, where the plant begins to establish itself above the soil surface. Seedlings typically possess embryonic leaves, or cotyledons, which initially provide nutrients to support early growth until true leaves develop. These true leaves are the first set of foliage that emerge after the cotyledons and represent the plant's ability to undergo photosynthesis independently.
During the seedling stage, the plant undergoes rapid growth as it acclimates to its environment, develops its root system, and strengthens its stems and leaves. Seedlings are vulnerable to environmental factors such as temperature fluctuations, water availability, and competition from neighboring plants or pests.
Proper care during this phase, including adequate watering, sunlight exposure, and protection from adverse conditions, is essential for promoting healthy seedling growth and ensuring successful establishment into mature plants.
There are little birds that spend a great deal of time on the back of a rhinoceros and eat the blood sucking ticks out of the rhino's ears. Answer the following questions regarding these creatures' relationships. 1) The bird -rhino relationship is an example of: a) parasitism b) mutualism c) predator- pray d) commensalism. 2) The bird-tick relationship is an example of: a) parasitism b) mutualism c) predator- pray d) commensalism. 3) The tick-rhino relationship is an example of: a) parasitism b) mutualism c) predator- pray d) commensalism
Answer:
1. b
2. c
3. d
Explanation:
The bird-rhino relationship is an example of mutualism.
What do you mean by mutualism?Mutualism is a type of symbiotic relationship where all species involved benefit from their interactions. While mutualism is highly complex, it can be roughly broken down into two types of relationship.
Mutualism describes the ecological interaction between two or more species where each species has a net benefit. Mutualism is a common type of ecological interaction.
Mutualisms occur in every aquatic and terrestrial habitat; indeed, ecologists now believe that almost every species on Earth is involved directly or indirectly in one or more of these interactions.
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During the Cambrian explosion approximately 535 to 525 million years ago, 1.all modern species of animals suddenly appeared. 2.animals rapidly diversified in the oceans. 3.a massive volcanic eruption nearly wiped out life on Earth. 4.great forests produced peat layers that were later transformed into coal.
Answer:
During the Cambrian explosion approximately 535 to 525 million years ago, 2. animals rapidly diversified in the oceans
Explanation:
Scientists have the theory that the Cambiran explosion, approximately 535 to 525 million years ago, was possible because of complex predator-prey relationships and increased atmospheric oxygen levels. All this situation promoted animal diversification. Thinking about evolution, animals directly evolved from protists.
A bird flew and landed on its swing. When the bird "hit" the swing, the swing began to move back and forth. What happened when the bird landed on the swing?
A. Energy was transferred from the air to the swing.
B. The swing and the bird gained energy.
C. The swing's energy and the bird's energy each stayed the same.
D. Some of the bird's energy was transferred to the swing.
Answer:
the correct answer is D
Explanation:
Answer:
answer is d
Explanation:
i took the test and got it
describe the role of nuclear fusion in the life cycle of a star.
Nuclear fusion is essential in a star's life cycle, as it provides energy through the fusion of hydrogen into helium during the main-sequence phase and leads to the creation of heavier elements as the star ages and potentially explodes as a supernova.
Explanation:The Role of Nuclear Fusion in the Life Cycle of a StarNuclear fusion plays a critical role in the life cycle of a star, providing the energy necessary for a star to shine and influencing its evolution. During the main-sequence stage, which a star spends most of its life in, hydrogen nuclei (protons) fuse together to form helium in the core of the star. This process, known as the proton-proton cycle, occurs at extreme temperatures and pressures, as in our sun's core which is about 14 million kelvin. The nuclear fusion of hydrogen into helium releases a substantial amount of energy, which maintains the star's luminosity and supports it against gravitational collapse.
As a star exhausts the hydrogen in its core, it undergoes various changes - for example, it may expand to become a red giant. Eventually, depending on its mass, it will fuse heavier elements and may end its life in a supernova explosion, contributing newly created elements to the cosmos, including those heavier than iron.
Thus, nuclear fusion not only keeps stars shining but also produces new elements, contributing to the chemical diversity of the universe.
A mother with type A blood and genotype IAi and a father with blood type B and genotype IBi have children who grow up and become regular blood donors. Of the possible children, which genotype would have the least valuable blood to donate?
IAIBAAAO
Why do you think the left atrium and left ventricle are shown on the right side of the diagram?
Answer: Because the heart model is always in anatomical position. It is always based on the patient.
The left atrium and left ventricle are shown on the right side of the diagram because it is a frontal section of the heart, which presents the heart as if it were cut in half from front to back.
Explanation:The left atrium and left ventricle are shown on the right side of the diagram because the diagram is a frontal section of the heart, which means it shows the heart as if it were cut in half from front to back. In this view, the left side of the heart is on the right side of the diagram and vice versa.
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In multicellular organisms A. somatic mutations are passed on to offspring produced by sexual reproduction. B. somatic mutations may be passed to daughter cells by mitosis. C. all mutations produce phenotypic changes. D. meiosis is not required for the transmission of germ line mutations to the next generation. E. all mutations are point mutations.
Answer:
B. somatic mutations may be passed to daughter cells by mitosis.
Explanation:
In multicellular organisms, somatic mutations may be passed to daughter cells by mitosis.
Mitosis has to do with the division of somatic cells as opposed to germ or reproductive cells. Hence, daughter cells from mitosis are exact copies of their parents. If a mutation occur in the somatic cell of a parent, such could be passed to the daughter cell through mitosis.
Somatic mutations cannot be passed via sexual reproduction. Sexual reproduction can only be used to passed germline mutations.
Not all mutations produced phenotypic changes. Some mutations are silent and have no phenotypic implications.
Not all mutations are point mutations.
The correct option is B.
In which of the following patterns of disease does the patient experience no signs or symptoms?
A) decline
B) prodromal
C) convalescence
D) incubation
E) incubation and convalescence
Answer:
The correct answer is option E) "incubation and convalescence".
Explanation:
The incubation period of an infectious disease is defined as the lapse between when a person is infected and the first symptoms are onset. While the convalescence stage is defined as the gradual recovery that a person experience once she or he overcomes the infectious disease. In both, the first and the last stage of the infectious disease (incubation and convalescence, respectively) the patient does not experience signs or symptoms of the disease.
Ethidium bromide is a common intercalating agent used to visualize DNA in electrophoresis gels by associating with the DNA in the gels and fluorescing under UV light to reveal bands. How does ethidium bromide associate with the DNA?
Answer:
EtBr inserts between the stacked bases in the DNA double helix.
Explanation:
EtBr is used for visualizing DNA bands as it fluoresces under the UV illumination. EtBr is an aromatic compound that is capable of inserting itself between the stacked bases of the DNA double helix. The hydrophobic environment around the base pairs where the EtBr intercalates is responsible for the fluorescence. As the EtBr molecule intercalates between these base pairs the cation of EtBr sheds the water molecules associated with it and this causes it to fluoresce under UV light as water is a quencher of fluorescence.In what ways do you think marine geography benefits marine science?
Marine biologists study biological oceanography and the associated fields of chemical, physical, and geological oceanography to understand marine organisms.
Why is it important to study marine science?Marine science recreates key role in the ongoing search to understand our world and to control its resources.
The interdisciplinary nature of the Marine Science curriculum will organise students to analyze deeply such co occuring issues as environmental alter, human clashes on the ocean, and biodiversity.
Thus, Marine biology is the study of marine organisms, their behaviors and relation with the environment.
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Which process must occur for a muscle to be able to relax
Answer: The concentration of calcium in the myofibril must decrease.
Explanation:s soon as the stimulus which causes myofibril to contract stops, its time for muscle to relax.
A low calcium level in the protoplasm is the utmost requirement of muscle relaxation otherwise sliding of myosin will continue and muscle will keep on showing contraction. In order for muscle contraction, calcium ion i.e. Ca²⁺ must come out of the protoplasmic reticulum so for relaxation reverse process occurs i.e. Ca²⁺ is pushed back to the protoplasmic reticulum. There are many pumps known as "calcium pumps" which facilitate this process. Now, the concentration of Ca²⁺ becomes comparatively low in the protoplasm which causes troponin C to detach from Ca²⁺. Their detachment causes actin and myosin to detach from each other too which finally leads to muscle relaxation.
Of the following, which is best supported to suggest where life is believed to have originated on Earth? Select one: a. RNA world hypothesis b. Primordial soup origin hypothesis c. Subsurface origin hypothesis d. Theory of natural selection
Answer: b. Primordial soup origin hypothesis
Explanation:
The primordial soup hypothesis is the basis of the origin of life on earth. Life originated in the ocean water as a result of the combination of chemicals from the atmosphere and energy from the sun to make up the amino acids. The amino acids are the building blocks of proteins. The protein was the basis of the development of life forms and their evolution on planet earth. The chemical evolution supposed to occur at least 3.8 billion years ago.
In the first minute of her talk, Earle lists several ways the oceans have changed in the past 50 years because of human impact. What are some of these ways?
Answer:
She mentions that more than ninety percent of the big fish in the ocean have been fished and eaten. That almost half of the coral reefs are dying and disappearing. She also mentions how oxygen levels are decreasing causing the ecosystem and wildlife to die.
*WARNING*
Do not copy this word for word as you'll be caught for plagarism!
Explanation:
The first minute of the talk:
"I want to share with you my personal view of changes in the sea that affect all of us, and to consider why it matters that in 50 years, we've lost -- actually, we've taken, we've eaten -- more than 90 percent of the big fish in the sea; why you should care that nearly half of the coral reefs have disappeared; why a mysterious depletion of oxygen in large areas of the Pacific should concern not only the creatures that are dying, but it really should concern you. It does concern you, as well."
Final answer:
Human activities over the past 50 years have led to significant changes in the oceans, including sea-level rise, decrease in fish populations, ocean acidification, introduction of non-native species, and pollution and habitat destruction.
Explanation:
Human Impacts on the Oceans
In the past 50 years, human activities have significantly altered the oceans. Some of the changes include:
Sea-level Change: Due to climate change, sea levels have been rising, affecting coastal processes and habitats like salt marshes.Decrease in Fish Populations: Overfishing and changes in marine ecosystems have led to large decreases in the abundance of fish.Ocean Acidification: The increase in carbon dioxide emissions has resulted in acidification of oceans, affecting marine life with calcium carbonate shells.Introduction of Non-native Species: Global commerce and other human activities have introduced thousands of invasive species, causing ecological and economic harm.Pollution and Habitat Destruction: Activities such as bottom trawl fishing, coastal development, and aquaculture have damaged marine habitats and contributed to pollution.These are just a few examples of the human impacts on ocean ecosystems, illustrating the urgent need for conservation and sustainable management of ocean resources.
Arthropods invaded land about 100 million years before vertebrates. This fact most clearly implies that ________.
a. arthropods have had more time to coevolve with land plants than have vertebrates
b. arthropods evolved before vertebrates did extant terrestrial
c. arthropods are better adapted to terrestrial life than are extant terrestrial vertebrates
d. vertebrates evolved from arthropods
Answer:
Arthropods invaded land about 100 million years before vertebrates. This fact most clearly implies that a. arthropods have had more time to co-evolve with land plants than have vertebrates
Explanation:
Arthropods are invertebrates animals. Its evolutionary ancestry dates back to the Cambrian period and they have had more time to co-evolve with land plants than have vertebrates. The vertebrates share a common ancestor. Scientists believe that the last common ancestor of all arthropods is a modular organism with each module covered by its own sclerite.
In garden peas, the axial (A) flower position is completely dominant to the terminal (a) flower position. You cross a true-breeding axial flowering plant to a true-breeding terminal flowering plant. What is the genotype of the true-breeding axial flowering plant?
Answer:
AA
Explanation:
A true breeding organism for a particular trait is an organism that would produce progeny with the same trait whe self fertilized.
Hence, since axial flower is represented by the allele A, a true breeding flowering plant will have the genotype AA.
Axial flower (A) is dominant over terminal flower (a).
True-breeding axial flowering plant will have the genotype AA.
True breeding terminal flowering plant will have the genotype aa.
AA is crossed with aa.
AA x aa
offspring: Aa, Aa, Aa and Aa.
All the offspring will exhibit axial flowering.
A homozygous tomato plant with red fruit and yellow flowers was crossed with a homozygous tomato plant with golden fruit and white flowers. The F1 all had red fruit and yellow flowers. The F1 were testcrossed by crossing them to homozygous recessive individuals and the following offspring were obtained:Red fruit and yellow flowers - 41
Red fruit and white flowers - 7
Golden fruit and yellow flowers - 8
Golden fruit and white flowers - 44
How many map units separate these genes?
A) 17.6
B) 15
C) 17.1
D) 18.1
Answer:
I think it's A correct me if am wrong am not that smart am sorry if am wrong