A jellyfish relies on diffusion to provide oxygen to its body cells, and yet it is much larger than the 1 cm limit imposed by diffusion. How can it be so thick and still meet its metabolic demands by diffusion alone?
A. Much of the thickness of a jellyfish consists
of metabolically inert materials that do not
require oxygen.
B. Jellyfish have specialized tubular cells that
facilitate the movement of oxygen throughout
the body.
C. The layers of metabolically active tissue
are very thick and highly folded, which
provides a large surface area for diffusion.
D. Jellyfish maintain a very large
concentration gradient for oxygen across their
body tissues.
E. Water makes up most of the body of a
jellyfish, and oxygen diffuses more rapidly in
water than in tissues.
A
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Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America. What outcomes could possibly occur where the ranges of two species overlap?
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Refer to Table 19-1. If the expression of alleles is simple dominance (D) and recessive (d), then the
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Compare and contrast the osmoregulatory challenges and solutions used by sharks and freshwater
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Unlike other microbes, archaea are able to thrive:
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