Which statement about the nitrogen cycle is true?
A) The nitrogen cycle requires different types of bacteria.
B) Nitrogen gas is converted to nitrates in plant leaves.
C) Nitrogen cannot be cycled through living organisms.
D) When plants and animals die, nitrogen is removed from the nitrogen cycle.
Answer: A
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Hemopoiesis begins early in embryonic development in the
A) bone marrow. B) spleen. C) lymphatic organs. D) yolk sac.
During interphase, most of the nucleus is filled with a complex of DNA and protein in a dispersed form called _________.
Fill in the blank(s) with the appropriate word(s).