Which of the following invertebrates has an
endoskeleton?
a. clams
b. lobsters
c. sea stars
d. earthworms
e. more than one of these invertebrates has an
endoskeleton
C
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Which of the following lacks sufficient penetrating power for bulk sterilization?
A. Alpha and beta particles B. Gamma radiation C. Ultraviolet (UV) radiation at 260 nm D. X rays
The carbon cycle is most easily studied as two interconnected subcycles
What will be an ideal response?
Researchers Tilman and Downing have demonstrated which of the following?
A) more stable biomass production during drought in high-diversity systems B) more stable biomass production during winter in high-diversity systems C) more stable biomass production under fertilization in high-diversity systems D) more stable biomass production under pesticide application in high-diversity systems
In general, minerals in plant foods have an absorption rate that is _______ than that in animal foods.
a) higher b) the same c) lower