A symbiont could be a(n):
A) commensal.
B) opportunist.
C) parasite.
D) all of the above
D) all of the above
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Ultraviolet radiation at the bactericidal wavelength destroy bacteria by
A. destroying endospores. B. damaging nucleic acid. C. preventing spore formation. D. denaturing proteins.
In most eumetazoans, the innermost tissue layer during development is the ____
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
As cleavage progresses, the cells of the embryo _____ and the whole embryo ______.
Fill in the blank(s) with the appropriate word(s).
Which of the following is FALSE regarding populations of living organisms?
A. Parents often produce many offspring. B. Population size is limited by the food supply. C. Individuals in populations actively compete for scarce resources. D. Individuals in populations show little or no variation.