The structure produced by cleavage of a human zygote is called a(n)
A) blastocyst.
B) gastrula.
C) blastopore.
D) embryonic disk.
E) chorion.
A
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What is gross primary production?
A. The carbon fixed during photosynthesis. B. All of the carbon fixation after cellular respiration is accounted for. C. Energy released by both primary and secondary consumers. D. Photosynthetic production plus energy recycled through detritivores. E. None of the answers is correct.
Which cell lacks a nucleus?
a. bacterial cell b. fungus cell
c. animal cell d. protist cell e. plant cell
In arid terrestrial environments, salt can accumulate in the soil because of
A. the selective uptake of water by plants. B. the activities of grazing animals. C. the precipitation of salt from dry air. D. the secretion of salt by plants. E. the settlement and evaporation of water.
Red blood cells, also known as __________, contain the hemoglobin that functions in rapid transport
of oxygen and, to a lesser extent, carbon dioxide.