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solniwko [45]
2 years ago
11

Please help me I will mark brainliest

Biology
1 answer:
forsale [732]2 years ago
8 0

Answer: B is the answer

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What component of Earth's atmosphere exists entirely as a result of photosynthesis?
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Answer:

oxygen gas

Explanation:

because oxygen is needed for life on Earth

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Although in humans there are 22 pairs of autosomal chromosomes, only three different chromosomal trisomies are commonly seen in
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The reason why only 3 out of the 22 possible autosomal trisomies are seen in newborns, is because the rest of them are chromosomal abnormalities not compatible with life and thus an spontaneous abortion occurs. The embryos suffering from these trisomies do not survive for more than a few weeks in the uterus, so the miscarriage often goes unnoticed for the mother as she may not have realized she was pregnant.

The only trisomies that are allow fetuses to be born are: Patau Syndrome (trisomy 13), Edwards Syndrome (trisomy 18), and Down Syndrome (trisomy 21). Out of these three, people with Down Syndrome have the largest life expectancy.

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How do selective pressures affect the genetic variation in the population
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EXPLAIN The scuba diver is a living system. The scuba gear, or self-
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Pt.I

All living things needs some form of oxygen to live. In talking about a scuba diver, we are talking about a human, who uses their lungs to breathe, and did not develop the ability to breathe under water. Instead, when in a body of water, we tend to hold our breaths until an opportunity arises for us to exchange our carbon dioxide for oxygen.

Take into account the scuba gear. The scuba gear fits the user, and has a number of protection, including the suit counter-balancing any pressure applied by the deep, and the tank providing much needed oxygen to the user during delayed periods within the water.

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<u>How does these two systems interact?</u>

Like as a human is breathing on land or even swimming, the human expels carbon dioxide, which forms into "air bubbles" that are then expelled into the water surrounding. The user then draws air from the pressurized air tank, and is able to breathe as such. This allows the user to stay underwater for much longer than just one breathe, and is able to travel farther inside the deep.

Inside this system, the Oxygen is first input into the oxygen tanks, which are then used by the diver. The diver would draw the oxygen from the tank (output), and he will then expel the used air into the surrounding water.

~

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Flower color in a particular plant species is determined by one gene locus. The allele at the locus can code for either red flow
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