Answer:
oxygen
Explanation:
Earth's early atmosphere before life began was devoid of oxygen. Intense volcanic activity occurred for around a billion years and the earth's surface was in molten state. When it started to cool early atmosphere was formed from the gases emitted by volcano. It contained carbon dioxide, methane, hydrogen sulphide, ammonia and small amounts of water vapor. But this atmosphere had no trace of oxygen.
The water vapor condensed and formed oceans. Photosynthesis by early plants finally released oxygen which became a part of atmosphere. Carbon dioxide was also used up in various cell processes and trapped in rocks and fossil fuels which decreased its share in atmosphere.
When faced with dangers close to both sides of your path of travel you should create:?
When faced with dangers on both sides of your travel path, creating a margin of safety is important. This involves maintaining a central position between hazards while driving and paying attention to traffic patterns when walking as a pedestrian, to avoid accidents.
When faced with dangers close to both sides of your path of travel, it is essential to create a margin of safety. You should position yourself in such a way that you have a clear view of the threats and can respond to them effectively. This concept can be applied in various scenarios such as driving, walking in a crowded city, or while planning outdoor activities.
For example, in driving, creating a margin of safety can mean adjusting your lane position away from potential hazards. If hazards are present on both sides, maintain a central position to give yourself the maximum distance possible from each. In the case of planning a route on a map, you would aim to avoid roads with heavy traffic or extreme isolation to keep a safe journey.
When walking in a city, applying the principle of looking in the appropriate direction based on the traffic flow is critical. For example, in countries where driving is on the right side, you look left first, then right. But in countries where driving is on the left, such as the UK or Jamaica, you should look right first then left. This habit can be crucial for pedestrian safety.
What is the definition of prophase
Final answer:
Prophase is the initial stage of mitosis where chromatin condenses into chromosomes, the nuclear envelope disintegrates, centrosomes move apart, and the mitotic spindle begins to form, allowing chromosomes to eventually align and separate.
Explanation:
Prophase is the first phase of mitosis, characterized by a series of events that prepare the cell for chromosome segregation. Early in prophase, the chromatin fibers become more tightly coiled and condense into discrete chromosomes. Each chromosome has already replicated and consists of two identical sister chromatids joined at the centromere. As prophase advances, the nucleolus fades and the nuclear envelope breaks down, allowing the spindle to interact with the chromosomes.
During prophase, centrosomes, having duplicated earlier in the cell cycle, move to opposite poles of the cell. The mitotic spindle fibers extend from these centrosomes, playing a crucial role in the subsequent alignment and separation of the chromosomes. The spindle apparatus begins to form, consisting of the centrosomes, the spindle microtubules, and the asters.
Which important complex is is formed due to complimentary binding at the enzyme active site
Patients who have negative expectations about the outcome of a surgical procedure may experience increased postoperative pain. this best illustrates the importance of
Active transport ________. uses atp as an energy source can involve the transport of ions can move solutes against their concentration gradient all of the answer options
Active transport uses ATP as the source of energy, takes part in the transport of ions, and can move solutes against the concentration gradient.
• A kind of cellular transport in which components like glucose, ions, and amino acids are mediated across a biological membrane towards the region, which already comprises ample of substances is known as active transport.
• The mechanism of active transport used ATP as the chemical energy to move the substances against their concentration gradient.
• The common regions where active transport takes place are the walls of small intestine and root hair cells.
Thus, the correct answer is all the options.
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Many trees and plants have green leaves in the summer that turn red, yellow and orange in the fall (autumn). Explain what happens and why it happens.
Answer:
During the fall the day gets shorter hence less sunlight this results to leaves stopping their food making process. The chlorophyll breaks down, the green color disappears and the yellow to orange color becomes visible
Explanation:
Flat and layered clouds with horizontal development are classed as
During the period of the fetus, the most rapid prenatal changes take place. true or false
Yes, the statement is true; the most rapid prenatal changes occur during the fetal period, especially in the third trimester, when there is an increase in body size and organ maturation.
The statement is true; the most rapid prenatal changes take place during the fetal period, notably in the third trimester. Prenatal development is divided into three stages: the germinal period, the embryonic period, and the fetal period, with each period seeing different types of growth and development. However, it is during the fetal period, especially the third trimester, that there is a significant increase in body size, accumulation of body fat, and maturation of all the organs.
By the end of the 38th week of pregnancy, all of the fetus's organs are fully functioning and the fetus is ready for birth. Any birth prior to this is considered premature. Therefore, the period of the fetus, particularly the later stages, is critical for ensuring the fetus is prepared for a healthy arrival into the world.
Hello, people of planet earth, I need help with a question for my friend Steve in science class, here on planet Neptune it is pretty hard can you help me, please ?
Describe conjugation between two paramecium.
put it in simplest form because Steve is a bit of an idiot.
What is the difference between a chromatid and a chromosome?
a. chromatids consist of dna, whereas chromosomes consist of proteins.
b. chromosomes are always replicated, whereas chromatids are not.
c. a chromatid always consists of two linear dna molecules, whereas a chromosome always consists of just one linear dna molecule.
d. a chromatid is one half of a replicated chromosome, whereas a chromosome consists of dna wrapped around proteins in a highly organized manner?
Can anyone help me please
BRAINLESET Exposure to UV rays can cause _____.
asthma
skin cancer
heart disease
lung cancer
i use gradpoint and originally i got that wrong and it showed me the right answer and it was skin cancer or B
Answer:
Skin cancer
Explanation:
Explain how the isotopes of an element differ. (1 point)
They each have a different number of electrons in their outermost energy level.
They each have a different number of protons in their nuclei.
They each have a different number of neutrons in their nuclei.
They each have a different charge.,
What happens when the supply of energy-rich molecules in a muscle is used up?
Which antibiotic would you use to determine if the recombinant dna was taken in?
Scientists have been concerned for several years about the bee population dying off. There are several theories about why their population is being reduced. One of these theories is that the pesticides being sprayed onto plants are killing them. Which is the best solution to this problem?
A) Continue to use harsh pesticides to grow food. Bees are not vital to the ecosystem.
B) Ask scientists to create a genetically modified bee that is unharmed by harsh pesticides.
C) Encourage farms that produce food to only use organic pesticides that do not have as harmful effect on the bees.
D) Completely stop the use of all pesticides regardless of the effect this has on our food supply, and monitor the bee population to see if they start to come back.
Answer:
c
Explanation:
Encourage farms that produce food to only use organic pesticides that do not have as harmful effect on the bees. We need to safely manage pest control so as not to cause bigger problems.
According to hadley, the most important factor causing circulation patterns in the atmosphere was:
How does the digestive system work with other systems to maintain homeostasis?
A species can develop genetic diversity __________.
A: Immediately
B: over a short period of time
C: over a long period of time
D: over any period of time
I think its C or D
PLEASE HELP
WILL GIVE MEDAL
Answer: B
Explanation:
On January 1, year 1, Stopaz Co. issued 8%, five-year bonds with a face value of $200,000. The bonds pay interest semiannually on June 30 and December 31 of each year. The bonds were issued when the market interest rate was 4% and the bond proceeds were $235,931. Stopaz uses the effective interest method for amortizing bond premiums/discounts and maintains separate general ledger accounts for each. To prepare each entry: Double-click the shaded cells in the Account Name column and select from the list provided the appropriate account name. An account may be used once or not at all for each entry. Enter the corresponding debit or credit amount in the appropriate column. Round all amounts to the nearest dollar. All rows may not be required to complete each entry. Prepare the journal entry to record the issuance of the bonds on January 1, year 1: Account NameDebitCredit Prepare the journal entry to record the payment of interest on June 30, year 1: Account NameDebitCredit Calculate the am
To prepare the journal entry to record the issuance of the bonds on January 1, year 1:
Cash $235,931
Bonds Payable $200,000
Premium on Bonds Payable $35,931
To prepare the journal entry to record the payment of interest on June 30, year 1:
Interest Expense $4,760
Cash $4,000
Premium on Bonds Payable $760
When Stopaz Co. issued the 8%, five-year bonds with a face value of $200,000 on January 1, year 1, the market interest rate was 4%, resulting in bond proceeds of $235,931. To record the issuance, the company would debit Cash for the amount received, which is $235,931. The Bonds Payable account is credited for the face value of the bonds, which is $200,000, and the Premium on Bonds Payable account is credited for the difference, representing the premium realized from the market interest rate being lower than the coupon rate. In this case, the premium is $35,931.
On June 30, year 1, when interest is paid semiannually, the journal entry would include debiting Interest Expense for the amount of interest accrued over the period. Since interest is paid semiannually, the annual interest is $16,000 (8% of $200,000), and for half a year, it would be $8,000. However, due to the premium on bonds, the company reduces the interest payment by the amortized premium. The difference between the stated interest and the reduced interest due to the premium is recorded in the Premium on Bonds Payable account, ensuring an accurate representation of the total cost of borrowing.
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PLEASE HELP ME! ASAP Should commercial fruit farmers be allowed to use ethylene to accelerate the ripening of fruit for the market? Why or Why not?
Please no bs and answer in detail thank you.
Which of these is a difference between a dna and an rna molecule?
The difference between a DNA and an RNA molecule is: A. DNA is double-stranded, whereas RNA is single-stranded. The other options mentioned are not accurate distinctions between DNA and RNA.
The key difference between DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) lies in their structural characteristics. DNA is typically double-stranded, forming the famous double helix, while RNA is single-stranded. Both DNA and RNA molecule contains nitrogenous bases and phosphate groups, but their five-carbon sugars differ; DNA uses deoxyribose, whereas RNA employs ribose.
DNA is a polymer composed of nucleotides, while RNA is also a polymer composed of nucleotides. Lastly, in terms of base composition, DNA contains thymine (T), whereas RNA replaces thymine with uracil (U). These distinctions are vital as they underlie the functional diversity and roles of DNA and RNA in genetic information storage and protein synthesis. So option A is correct.
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Which of these is a difference between a DNA and an RNA molecule?
A. --DNA is double-stranded, whereas RNA is single-stranded.--
B. DNA contains nitrogenous bases, whereas RNA contains phosphate groups.
C. DNA contains five-carbon sugars, whereas RNA contains six-carbon sugars.
D. DNA is a polymer composed of nucleotides, whereas RNA is a polymer composed of nucleic acids.
E. DNA contains uracil, whereas RNA contains thymine.
Which hypothesis is most relevant for the students experiment ?
The visceral motor division of the pns __________. the visceral motor division of the pns __________. regulates the contraction of smooth and cardiac muscle and regulates secretion by the body's many glands includes taste and smell regulates only the parasympathetic division of the ans regulates only the sympathetic division of the autonomic nervous system
Which compound contains a radical? NaOH NaCl CO 2 CO
The compound that contains a radical is called NaOH.
Explanation:
Radical, also called Free Radical, in chemistry, a fragment that contains at trivial one unpaired electron. Most molecules include even numbers of electrons, and the covalent chemical bonds including the atoms commonly within a molecule normally consist of pairs of electrons jointly shared by the atoms combined by the bond
Which of these is most likely to cause light pollution?
A. Radioactive deposit
B. Family farm
C. Pavement runoff
D. Parking lot
D. Parking lot is correct
One character in peas that mendel studied was yellow versus green seeds. a cross between a homozygous yellow line (yy) and a homozygous green line (yy) will result in f1 plants that are heterozygous (yy) for this trait and produce yellow seeds. when an f1 plant undergoes meiosis, what gamete types will it produce, and in what proportions
Within the cell, dna is found in the nucleus. which of the other structures within the cell listed below normally contains dna as well
Enzymes, such as the one shown in the picture, work by fitting onto the substrate molecule like a lock-and-key action. Which statement is true, with regard to the enzyme and the substrate? A) The enzyme weakens chemical bonds in the substrate and catalyzes a change into the product. The enzyme itself remains unchanged. B) The enzyme weakens chemical bonds in the substrate and catalyzes a change into the product. The enzyme is also consumed in the reaction. C) The substrate reacts with the enzyme in the active site to produce a product. The enzyme, though changed, does not become a part of the product. D) The substrate reacts with the enzyme in the active site to produce a product. Both the enzyme and the substrate combine and change into a product.
The correct option is A.
Enzymes are biological catalysts that speed up the rate of biochemical reactions but they are not used up in the process. Enzymes speed up chemical reactions by lowering the activation energy of the reaction. All chemical reactions have activation energy, this is the smallest amount of energy that the reacting species must possess before they can under a chemical reaction. When an enzyme lower this energy the reaction occurs faster but the enzyme remains unchanged.
Pulmonary edema is a condition caused by excess fluid in the lungs. this fluid collects in the alveoli. what parameter of the fick equation increases during pulmonary edema?