The central nervous system includes
a. the brain.
b. the spinal cord
c. interneurons
d. all of these.
e. a and b only.
D
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Before gastrulation, the future destiny of cell lineages is largely established by ____
a. the genotype b. the portion of egg cytoplasm c. surface recognition factors on the plasma membrane d. the number and type of organelles e. the sperm cytoplasm
The sporophyte generation of a plant is and produces spores.
A. multicellular; diploid B. diploid; haploid C. haploid; diploid D. triploid; haploid E. triploid; diploid
Why is the ocean off the coast of Florida warmer than it is off the coast of Western Mexico?
A) Florida is closer to the equator. B) Mean precipitation is higher in Mexico. C) Wind patterns are clockwise in the Atlantic. D) Ocean currents are coming from the tropics rather than the poles.
The net weight of all of the organisms living in an ecosystem is its
A. combined output of metabolism and photosynthesis. B. photosynthesis minus metabolism. C. productivity. D. biomass. E. vital force.