Lymphocyte maturation involves
A. B cells maturing in bone marrow sites.
B. hormonal signals that initiate development.
C. T cells maturing in the thymus.
D. release of mature lymphocytes to begin migration to various lymphoid organs.
E. All of the choices are correct.
Answer: E
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A population declines when
A. animals are removed randomly. B. death rate exceeds reproductive rate. C. reproductive and death rates are equal. D. reproductive rate exceeds death rate. E. smaller animals are selectively removed.
Large polymers are formed from smaller subunits
by what type of reaction?
a. oxidation b. reduction c. condensation d. hydrolysis e. decarboxylation
What is an asteroid?
a. dust and small rock orbiting around the sun b. a ball of ice with a tail c. a small planet d. a small sun with weak solar emissions e. more than one of these
Compare and contrast the digestive process in animals with two-way flow through their digestive system and those
that have a digestive system with one-way flow. What will be an ideal response?