B) short because it has both t alleles and no T alleles
Answer: During vigorous exercise your breathing rate increases in order to intake more oxygen
Explanation: during vigorous exercise / activity the body needs more oxygen in order to produce energy so your breathing rate increases in order to reach the demand of more intake of oxygen , and your muscles work harder due to an increase in oxygen demand and how much oxygen the muscles take from the blood during vigorous exercises , BUT during rest we have normal rate of oxygen intake because your body is at rest at that moment .
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Your answer is C.) The hydrogen bond between complementary nucleotides
Those rectangles are nucleotides, and the nucleotides are held together by hydrogen bonds.
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It's depends on the size of molecule. big ones cannot pass the membrane while smaller molecules can.
