Pyrogens are
A. fever-inducing substances.
B. fever-inhibiting substances.
C. phagocytosis-enhancing substances.
D. complement activators.
A
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Three molecules that easily diffuse through the plasma membrane are oxygen, carbon dioxide, and urea.
a. true b. false
Design a complete ecosystem that would sustain a number of living organisms for several years in a sealed container
The only thing that can be added is sunlight. Explain why you have selected each organism. What will be an ideal response?
Which mechanism would prevent interbreeding between two species of fish living in the same habitat?
a. sympatric isolating mechanisms b. allopatric isolating mechanisms c. equilibrium isolating mechanisms d. reproductive isolating mechanisms e. preadaptive isolating mechanisms
A stem cell divides into two daughter cells. One of the daughter cells goes on to become a terminally differentiated cell. What is the typical fate of the other daughter cell?
What will be an ideal response?