In pinus species male cone matured earlier than female cone because it male cone producing more pollen grain.
Explanation:
Pinus species don't have flowers who has nectar and pollen. Pine trees can’t attract bees and butterflies for pollination. Wind play vital role for pollination in pinus species tree.
The male cones produce producing pollen grains, which drift to the female cones on other trees. After few years mature the non-fertilized female pine cone mature to become the woody cones
Which factor is most likely to have contributed to the high fertility rate in
Africa?
O
A. Lack of modern transportation systems
O
B. Lack of modern agricultural technology
O
c. Lack of economic opportunity for women
O
D. Lack of access to fresh water
Answer:
c. Lack of economic opportunity for women
Explanation:
Women with better economic opportunities, are able to position themselves better in relation to their body and their wills, than women with less economic opportunities. In addition, women with more economic opportunities are more likely to control their reproduction, while poorer women do not always have access to contraceptive methods and end up having more unscheduled children. This statement is common in places with high rates of social inequality, such as in Africa, where the high rate of fertility is directly linked to the lack of economic opportunity for women.
Carbon dioxide made by cells leaves your body through the respiratory
system by moving from the
A. alveoli to the bronchi to the bronchioles
B. bronchi to the bronchioles to the nose
C. trachea to the bronchi to the bronchioles
D. bronchioles to the bronchi to the trachea
Answer:
The answer is D
Explanation:
After gaseous exchange take place in alveoli, unwanted gases such as CO2 will move from alveoli -> bronchioles -> brochi -> trachea -> nose .
Gametes produced by an organism contain a combination of genes from that organization. In every gamete, this combination is -
Answer:
In every gamete, this combination is haploid.
Explanation:
When we talk about gametes, we refer to specialized haploid cells for reproduction. It is these cells that unite in fertilization and originate a new being and they are, therefore, that carry the characteristics that must be passed on to a new generation. A haploid cell has only one set of chromosomes (n), while diploid cells have two sets of chromosomes (2n).
Human gametes are sperm and eggs. Sperm are male reproductive cells and are formed in seminiferous tubules, a region of the testicles. Men, after puberty, produce sperm continuously until the end of life. The sperm formation process is called spermatogenesis.
Female gametes, in turn, are eggs, more correctly called oocytes or secondary oocytes. These cells are produced in the female ovary, inside the ovarian follicles. Unlike men, female gametes are still produced in embryonic development and, subsequently, undergo a maturation phase. The woman normally releases eggs at puberty until menopause. The process of forming the female gamete is called ovogenesis or ovulogenesis.
Which is one of the bases found in DNA?
Answer:
a, c, t, g
Explanation:
uracil (u) is in place of t in rna
How does increasing the size of the habitat affect carrying capacity? Explain your answer. Recall the scenarios: 0-15, Little land, 15-30 years, Moderate land; 30-45 years, Ample land.
Answer:
The maximum number of a particular kind of species that a habitat can hold is termed as the carrying capacity of that place. The carrying capacity depends on the availability of resources present in an area. If the population of a species goes beyond the carrying capacity, then the organisms will compete for food and other resources.
When the size of a habitat is increased, the carrying capacity will increase. This is because there will be more space and resources to feed more species. As there will be more resources, even the growth of plants will be more in that area.
Answer:
The carrying capacity of a habitat is the maximum number of organisms a habitat can sustain over a long period of time. Carrying capacity is dependent on the number of resources available in an area. Therefore, if the resources available increase, the population of that organism will also increase. In the three scenarios we tested how the population of rabbits changed over time with different amounts of land. When there was little land, the rabbit population was consistent, never exceeding 100. As we changed the setting to moderate land, we saw a population growth of around 2.3% (around 230). Lastly, when there was ample land, the rabbit population reached its height at around 430.
Ecologists will often represent the amount of potential food available for each trophic level in an ecosystem with a(n)
Answer:
Ecologists will often represent the amount of potential food available for each trophic level in an ecosystem with a(n) biomass pyramid.
Explanation:
A biomass pyramid can be defined as a diagram which quantifies the biomass as we move up the trophic levels in a pyramid. It is often plotted as the food (in calories or grams) per unit area. The biomass pyramid quantifies the biomass present at each trophic level.
Hence, a pyramid of biomass is the best way to represent the amount of food available at each trophic levels in a pyramid.
Ecologists will often represent the amount of potential food available for each trophic level in an ecosystem with a biomass pyramid.
Explanation:
Ecologists represent various structures of trophic levels in an ecosystem using ecological pyramids. Ecological biomass pyramids graphically depicts the bioproductivity or the amount of biomass produced and available in a unit area of a trophic level in an ecosystem.
The producers, are at the highest level, produce the highest amount of biomass is at the base of the pyramid; whereas, the tertiary consumers are at the least level with the least amount of biomass is at the top of the pyramid.
Ecologists use these data to depict the primary production of biomass at each level and the net productivity reached in an ecosystem.
stion 5
An increase in carbon dioxide in the atmosphere will MOST likely
affect which type earth activity?
complete
hts out of
Select one:
O
a. Volcanic eruption frequency
Flag
estion
O
b. Mantle convection rate
O
c. Cave formation rates
O
d. Earthquake frequency
Check
Next pa
Answer:
An increase in carbon dioxide in the atmosphere will MOST likely affect C: Cave formation rates .
Explanation:
"Carbon-di-oxide" is an important gas which 'controls' the Earth's temperature. CO2 including methane are greenhouse gases which absorb a lot of energy and then re-emit it. Without these gases, earth would get frozen. But, if these gases are in excess, then temperature of earth would rise like that of Venus, up to 400 degree Celsius.
If CO2 increases, there will be an increase in cave formation activity. Rain water takes CO2 from the air and penetrates in the soil. This results in formation of "limestone" as 'carbonate' accumulates in the soil. This forms 'cave of limestone' with the help of 'groundwater' as limestone dissolves easily in water.
Answer:
Less build up of ice at poles
Explanation:
The increase of carbon dioxide will increase global warming, which will cause the global temperature to increase, and cause less ice poles because of the high temperature.
Name of the organ systems that you use for walking from the front of the school yard
Answer:
Leg
hope so , joint
may be
Organization in which different cells are specialized for different functions, but each cell works alone, is characteristics of
A.cell-level organization
B.tissue-level organization
C.organ-level organization
D.organ system-level organization
Explanation:
B. tissue - level organization
The protein channel illustrated in model three is a ligand gated channel. What must occur for the gate to open and allow movement of ions across the membrane?
Answer:
The ligand must bind to a target protein to move ions across the membrane.
Which of the following is not a typical pattern found in the Earth system?
a. rock cyclo
b. water cycle
carbon cycle
d. calcium cycle
Please select the best answer from the choices provided
Ooo
Answer:
D. calcium cycle
Calcium cycle is not a typical pattern found in the Earth system. :)
Explain how the wound healed itself over time
Skin injuries initiate a healing process involving blood clot formation and cell repair stages.
The first step involves the formation of a blood clot that stops bleeding. Various cells participate in repairing the wound, with fibroblasts aiding in collagen replacement and angiogenesis promoting new blood vessel growth.
What is the role of the structure shown here during protein synthesis?
A) mRNA delivers codons from DNA in the nucleus
B) mRNA attaches to the ribosome
C) rRNA forms ribosomes
D) tRNA transports amino acids from the cytoplasm to the ribosome for translation
Answer:
D) tRNA transports amino acids from the cytoplasm to the ribosome for translation
Explanation:
The structure illustrate the transfer ribonucleic acid or tRNA.
The tRNA contains the anticodon in the form of amino acids and as such, it transports the amino acids from the cytoplasm where it is located to the ribosome during protein synthesis.
On getting to the ribosome, the anticodon on the tRNA binds with the codons on the mRNA and this results into the translation of the respective amino acids.
The translated amino acids are then linked together by a peptide bond to complete the process of protein synthesis.
When referring to height in terms of genotypes, is there a reason why V and v are used to commonly represent the alleles?
Answer:
Explanation:
Geneticists use letters to represent alleles of different characters.
(Alleles: one of the two or more alleles of a character.)
A single letter is used to represent both the alleles of a particular character.
A capital letter represents a dominant allele, while a small letter represents a recessive one.
The letters do not just have one standard representation. same letter can be used to represent different characters. However, the letters may relate to the allele. For example: the letter 'B' can be used to represent Brown eyes.
A neuron in the skin detects tissue damage in the skin during a burn and informs the brain and spinal cord. This neuron is part of what pathway?
Explanation:
The neuron is part of the somatosensory pathway
The nervous system is subdivided into; the central nervous system (CNS), which includes the brain and spinal cord, within the vertebral column; and the peripheral nervous system, which includes nerves that branch into the rest of the body from the brain and spinal cord. Nervous tissue responds to electrical impulses, allowing for communication between different regions of the body.
The peripheral nervous system is further divided into the somatic nervous system responsible for carrying out sensory and motor information between the peripheral nervous system- including sensory organs like the eyes; and central nervous system; and the autonomic nervous system which regulates involuntary bodily functions like heartbeat, breathing and blood flow. The ANS is mainly acts unconsciously and affects smooth muscle and internal organs. It is related to homeostasis- where the body maintains a constant internal balance in pH, temperature, blood pressure etc.
Somatosensory pathways contain primary, secondary, and tertiary neurons which are capable of processing information about vibration, touch, temperature, and pain- information is passed on after receiving stimuli from the body's internal or skin receptors. Thus the precision is greater in the lips and fingers (directly involved in tactile interactions with stimuli) than on the back.
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Create a Punnett square to solve the following sex-linked inheritance problem (remember to use the sand
ss a male who does not have hemophilia with a woman who does hoy
Hemophilia is a sex-linked recessive trait. Cross a male who does not have hemophilia with
hemophilia. What is the probability of the following:
Male children with hemophilia:
Male children without hemophilia:
Female children with hemophilia:
Female children that are carriers for hemophilia:
Answer AND Explanation:
Let H represent gene for normal blood clotting and h for haemophilia.
XH Y
Xh XHXh XhY
Xh XhXH XhY
Male children with hemophilia: 50%
Male children without hemophilia: 0 %
Female children with hemophilia: 0%
Female children that are carriers for hemophilia: 50%
a covalent bond is formed as the result of what?
Answer:
covalent bonding occurs when pairs of electrons are shared by atoms
Explanation:
atoms will bond conveniently with other atoms in order to gain stability
A covalent bond is a type of strong bond formed between two atoms by sharing electrons to complete their valence shells, aiding in their stability. This is unlike ionic bonds, which form through the attraction of opposite charges. An example of this is the formation of water molecules.
Explanation:A covalent bond is a type of strong bond that is formed between two atoms of the same or different elements. This bond formation occurs when the atoms share electrons to fill their valence electron shells, which is the outermost shell of an atom and helps in achieving the stability of the atom.
For example, the formation of water (H₂O) molecules demonstrates covalent bonding. Here, the hydrogen and oxygen atoms combine, where the electron from hydrogen splits its time between the incomplete outer shell of the hydrogen and the oxygen atoms. This sharing of electrons helps fill the outer shell of both these elements, making them more stable.
Thus, unlike ionic bonds that form by the attraction between positively and negatively charged ions, a covalent bond shares electrons in a mutually stabilizing relationship, thereby completing their valence shells.
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3. In what possible scenario would the female birds evolve to having the singing trait? (5 points)
Answer:
I think the birds stopped singing because there are too many predators that found and ate them. If the predators left, or if there were less, more birds will start singing because there will be a less chance of getting eaten or preyed on.
Final answer:
Female birds might evolve the singing trait if estrogens affect their sensory capabilities, which could lead to changes in mate selection and reproductive success. This trait may be selected for if there is a preference for certain songs associated with specific beak sizes that contribute to reproductive isolation.
Explanation:
In a scenario where female birds evolve to have the singing trait, we must consider several key factors related to natural selection and mate choice. Mate selection in birds is often mediated by song, and through this process, certain traits are preferentially selected as they enhance reproductive success. Should estrogens influence birds' sensory capabilities, it might make environmental cues for singing more salient, hence potentially leading to females singing if it offers a selective advantage.
One example could involve reproductive isolation, where populations of birds become separated. If beak size and shape influence song, and if females prefer songs similar to their own, singing could become a trait under sexual selection pressure in females. If this leads to preferential mating and strengthens reproductive barriers, it may result in females evolving the singing trait to ensure reproductive success and minimize detrimental hybridization.
which type of mutation results in the formation of a protein with one inccorrect amino acid
The type of mutation that results in the formation of a protein with one incorrect amino acid is missene mutation.
Explanation:
Missene mutations are point mutations where there a change occurs in a single nucleotide. This results in a different codon and the production of a different amino acid. Missene mutation is one of the simplest types of mutation.
Sometimes missene mutation cause the production of a protein that is similar to the protein which was o be produced. In this case much variations are not produced. This is called conservative mutation.
Some amino acids are encoded by more than one codon and if a mutation results in a new codon which codes for the same amino acid there will be no change in the protein produced. This is called synonymous substitution.
Diseases like sickle cell anaemia are caused by missene mutation.
HELP! 50 POINTS!! WRITE IN YOUR OWN WORDS! WILL MARK BRAINLIEST
Evolution is sometimes a controversial topic. Write a paragraph (minimum 5 short paragraphs) including the following:
What is your opinion about evolution?
Do you think there should be a controversy?
Do you think alternatives to evolution should be taught in schools?
Why or why not?
Answer:
Evolution in my opinion is something that is up to the individual to believe. The theory of evolution has neither been proven or disproven. I think there should be a controversy so that we can either prove the theory, or disprove it and think of a different theory. Teaching alternatives in school would be a great idea. It would let the student derive for themselves which one they think is more accurate.
Explanation:
What happens to the image if you try to magnify it using 40X or 100X *
Answer: It gets bigger
Explanation:
Consider this animal cell. The organelles in an animal cell are labeled. Which organelle is labeled A?
Final answer:
The label 'A' in an animal cell diagram usually indicates the nucleus, which houses DNA and regulates gene expression, but without seeing the image, it's not possible to confirm this. The nucleus is one of many specialized organelles in animal cells.
Explanation:
Within an animal cell, various membrane-enclosed organelles perform specialized functions. If you are referring to the label 'A' in a diagram of an animal cell, it commonly points to the cell's nucleus, although without the actual image it's impossible to be certain. The nucleus is a central organelle that contains the cell's genetic material (DNA) and controls the cell's activities by regulating gene expression. The mitochondrion, often called the powerhouse of the cell, generates adenosine triphosphate (ATP), which is the energy currency of the cell. Animal cells also contain other specific organelles such as lysosomes and centrosomes that are not found in plant cells.
The organelle labeled A in the image is the nucleus.
The nucleus is the most important organelle in a eukaryotic cell, as it houses the cell's genetic material (DNA). The nucleus is typically the largest organelle in an animal cell and is surrounded by a double membrane called the nuclear envelope. The nuclear envelope has pores that allow for the transport of materials into and out of the nucleus.
Some of the functions of the nucleus:
Stores the cell's DNA
Controls the cell's gene expression
Produces ribosomes
The nucleus is essential for cell growth, division, and differentiation. Without a nucleus, a cell would not be able to function properly.
which of the following is not a fossil fuel
Answer:
wood
Explanation:
Yabine is studying energy from food in her nutrition class. She learns that fats, proteins, and carbohydrates can store different amounts of energy because they have different chemical
Answer:
She learns that fats,proteins and carbohydrates can store different amount of energy because they have different chemical structure or construction.
Explanation:
Carbohydrate,protein and fat differ in their chemical structure.
Carbohydrates are the polyhydroxy aldehydes or polyhydroxy ketones.Proteins are the polymer of amino acids joined by peptide linkage whereas fats are the monomer of fatty acid.
Monosaccharide,amino acids and fatty acid differ in their chemical and biochemical structure and also contain different number of carbon atoms.
That"s why carbohydrate,protein and fat can store different amount of energy.
Carbohydrates, lipids, and proteins are energy-yielding nutrients that the body breaks down into molecules small enough to be absorbed and converted to ATP. These nutrients can be obtained from plant and animal foods and can sustain life for several weeks.
Explanation:The energy-yielding nutrients are primarily carbohydrates and lipids, while proteins mainly supply the amino acids that are the building blocks of the body itself. You ingest these in plant and animal foods and beverages, and the digestive system breaks them down into molecules small enough to be absorbed. The breakdown products of carbohydrates and lipids can then be used in the metabolic processes that convert them to ATP. Although you might feel as if you are starving after missing a single meal, you can survive without consuming the energy-yielding nutrients for at least several weeks.
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After a natural disaster such as a hurricane or tornado, what will happen in the damaged ecosystem?
A) Nothing; it will remain uninhabited.
B) A new, different ecosystem will evolve.
C) An ecosystem like the previous one will be re-established.
D) No one really knows what to expect after a natural disaster.
Answer:
C
Explanation:
C. It's right.
Answer:
An ecosystem like the previous one will be re-established
Explanation:
How is a dihybrid Punnett Square different from a monohybrid Punnett square?
Answer:
A dihybrid cross tracks two traits. Both parents are heterozygous, and one allele for each trait exhibits complete dominance. A monohybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in a single given trait.
Answer:
Dihybrid shows more phenotypes
Explanation:
For a monohybrid cross, individual alleles are used, whereas for a dihybrid cross, pairs of alleles are used. A Punnett square for a monohybrid cross is divided into four squares, whereas a Punnett square for a dihybrid cross is divided into 16 squares.
Which of the following could be true of two different species that have a competitive relationship in the same ecosystem?
A: one species preys on the other
B:the relashionship is mutually beneficial
C:they share the same niche
D.one species benefits while the other is neither helped or harmed
Answer:
The correct option is C) they share the same niche.
Explanation:
In biology, a competitive relation can be described as a relation in which one organism competes with the other one for resources like food, water etc. They might be feeding on the same prey and hence, will have to fight for their food. Most likely, these organisms will belong to the same niche where there will be a scarcity of a resource for which they would be fighting. Hence, C is the correct option.
Which of the following is NOT an advantage of hydroelectric power?
A. It is clean, safe, and efficient.
B. It does not contribute to air pollution.
C. Only certain locations are suitable for building a dam.
D. Water is naturally renewed by the water cycle.
Answer: C is the correct answer, only certain locations are suitable for building a dam.
Explanation:
an apartment being treated for roaches was sprayed with a pesticide in the graph the number of roaches seen each day was plotted each day after the treatment Day Zero represents the day before the apartment was treated what can you conclude from the graph
Answer:
it is c (The treatment was only effective as a short-term solution)
Explanation:
i just took the post test
which term refers to the behavior of two species attempting to use the same living space , food source ,and water source?