During respiratory exchange, carbon dioxide moves from the blood into the alveoli due to:
a. the presence of a permease, which removes carbon dioxide from the capillaries.
b. potassium cotransport.
c. diffusion down a concentration gradient.
d. the air pressure of dissolved oxygen, which forces it out.
e. the contraction of the diaphragm, which creates a vacuum that pulls it out.
C
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a. dorsal lip b. ectoderm c. gray crescent d. endoderm
The type of sediment limits the kinds of organisms that can live in a particular area
Indicate whether the statement is true or false
Buford is a very successful high school athlete who has been diagnosed with diabetes. He needs to do well in sports so that he can receive a university scholarship. He dreams of getting into the pros, too — his whole family is counting on him! However,
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Bryophytes were the dominant plants in the first 100 million years of plant evolution. By the Carboniferous period, seedless vascular plants formed giant forests. Why were these plants able to outcompete bryophytes?
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