The best definition of population density is the number of individuals:a
of all species in a given area.
b. of one species in a given area.
c. in a given area at a given time.
d. of all species in a given area at a given time.
e. of one species in a given area at a given time.
e
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If a diploid cell with 40 chromosomes undergoes meiosis, each of the daughter nuclei would have
______ chromosomes.
a. 10 b. 20 c. 40 d. 60 e. 80
The first marine biology laboratory was:
a. the Scripps Institute of Oceanography. b. the Marine Biological Laboratory at Woods Hole. c. the Rosenstiel School of Marine and Atmospheric Research. d. the Friday Harbor Laboratories. e. the Duke University Marine Laboratory.
Facilitated diffusion differs from passive diffusion in that facilitated diffusion is
a. mediated only by a protein channel. b. mediated only by a protein carrier. c. mediated by a protein carrier or channel. d. against the concentration gradient.
Materials such as food, minerals, and oxygen are passed to cells through
A) water. B) interstitial fluid. C) matrix fibers. D) neurons.