The lymphoid organ in which B lymphocytes are produced is the
A. spleen.
B. lymph nodes.
C. red bone marrow.
D. thymus gland.
E. All of these produce B lymphocytes.
Answer: C
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Which digestive structures in humans secrete amylase?
a. liver and gallbladder b. liver and pancreas c. pancreas and gallbladder d. pancreas and salivary glands e. pancreas, liver, and salivary glands
Which of the following is true of species diversity over time?
1.The distribution pattern of protozoans most closely matches that of insects.
2.Angiosperm diversity in the Paleozoic most closely matches that of insects.
3.Trilobites expanded in the Mesozoic before going extinct.
4.Insects have had the greatest species expansion during the Cenozoic.
Gross primary productivity refers to the total
a. quantity of solar energy available to the ecosystem in a given period of time. b. quantity of solar energy reaching a given area of the ecosystem. c. energy trapped initially by the producers. d. energy used by the heterotrophs of the ecosystem in a given period of time. e. energy used by the producers for their growth and reproduction
Speciation events that occur when the geographic ranges of the populations involved overlap are termed ________
Fill in the blank(s) with correct word