The organ of the lymphatic system where T cells mature is the
A. spleen.
B. thymus.
C. tonsil.
D. lymph node.
E. heart.
B. thymus.
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When a ciliate reproduces asexually by mitosis
A. The macronucleus divides into two with each new cell receiving an identical macronucleus. B. The macronucleus divides into four micronuclei with each new cell receiving two micronuclei each. C. The macronucleus doesn't divide but it goes to one new cell and the micronuclei go to the other. D. The macronuclei fuse with the micronuclei and then divide into two with each new cell receiving an identical fused nucleus.
It is generally thought that four critical innovations arose during the evolution of our ape-like ancestors into humans. All of the following are innovations except
a. use of brain power for abstract thought. b. development of the opposable thumb. c. expansion of the human brain. d. toolmaking. e. bipedalism.
A ________ species is fundamentally essential to an ecosystem; its loss changes the structure of the entire community, even though it may only represent a small portion of the population
A) rivet B) keystone C) redundant D) footprint E) baseline
The kidneys of the ________ are so efficient it never has to drink water.
A. turtle B. camel C. frog D. kangaroo rat E. kangaroo