Which of the following consists of organisms, all of which share a common gene pool?

a. a community
b. a population
c. a biosphere
d. an ecosystem
e. a landscape


b

Biology & Microbiology

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Describe the production of pollen

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Which of the following statements about B cells is true?

A. B cells change into plasma cells after encountering an antigen and then produce antibodies. B. B cells carry receptor molecules on their cell surfaces. C. Some B cells become memory cells. D. B cells develop and mature in the bone marrow. E. All of the answer choices are correct.

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Which of the following elements, essential to life, is a trace element?

A) phosphorus B) carbon C) iodine D) calcium

Biology & Microbiology