Which statement best describes why O2 and CO2 can both be exchanged simultaneously at the alveoli and pulmonary capillaries?
A) Nitrogen is at a high pressure in both the alveoli and pulmonary capillaries and drives the exchange of O2 and CO2.
B) Blood in both the alveoli and pulmonary capillaries is at equilibrium.
C) Each gas acts independently and diffuses down its own partial pressure gradient.
D) Blood in the pulmonary capillaries is high in both O2 and CO2.
E) Blood in the alveoli is high in both O2 and CO2.
Answer: C) Each gas acts independently and diffuses down its own partial pressure gradient.
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A male is heterozygous for the trait that produces freckles on the skin, and he has freckles. If he marries a woman who is also heterozygous for freckles, ______ percent of their children will be freckled and __________ percent of their children will be heterozygous.
A. 100% freckled, 100% heterozygous B. 75% freckled, 50% heterozygous C. 75% freckled, 25% heterozygous D. 50% freckled, 50% heterozygous E. 100% freckled, 75% heterozygous
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A defining characteristic of allopatric speciation is
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