Nematocysts in cnidarians are:
a. reproductive cells
b. excretory organs
c. sets of muscle cells
d. circulatory cells
e. defensive cells
e
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Mammalian steroid hormones are signaling molecules that function in which of the following types of cell signaling?
A. juxtacrine B. paracrine C. autocrine D. endocrine E. All of these choices are correct.
Although it is said that the twentieth century was the Age of Physics, it is predicted that the twenty-first century will be the age of
A. chemistry. B. computers. C. microbial biodiversity. D. mathematics.
Insulin is a product of the
A. pancreas. B. stomach. C. brain. D. kidney. E. liver.
All the populations of all the different species interacting with one another in the same environment is called
A. predation. B. symbiosis. C. diversity. D. an ecosystem. E. a community.