In a(n) ________ circulatory system, blood is pumped by a heart through blood vessels.
Fill in the blank(s) with the appropriate word(s).
closed
In a closed circulatory system, blood is pumped by a heart through blood vessels.
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The change from negative serum, without antibodies specific to an infecting agent, to positive serum, containing antibodies against that infecting agent, is called
A. ELISA. B. complement fixation. C. seroconversion. D. serum reversion.
Meiosis functions in _____
a. asexual reproduction of single-celled eukaryotes b. growth in multicelled species c. sexual reproduction d. asexual reproduction of single-celled eukaryotes and growth and tissue repair in multicelled species e. cellular repair in multicelled species
Earthworms have a mouth and an anus, but they also excrete liquid wastes. Through which of the following structures do they secrete nitrogenous and other wastes?
a. exosome b. tube cell c. nephridiopore d. Malpighian tubules
Which is a group of individuals of the same species occupying a given area?
a. individual b. species c. population d. polyploid e. gene pool