During a human pregnancy, implantation occurs at which stage?

a. zygote
b. early cleavage
c. blastocyst
d. gastrula
e. morula


C

Biology & Microbiology

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When arthropods molt, they may change in four of the following ways. Which one is the exception?

A. Body form and maturity B. Sex C. Body size D. Eating habits E. Sensory structures

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Blastomyces dermatitidis occurs in the (eastern/central/southwestern/western) part of North America

What will be an ideal response?

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The infectious agent that causes AIDS is a

A) virus. B) bacterium. C) yeast. D) protozoan. E) mold.

Biology & Microbiology

Nitrogen fixation results in the

A) loss of biologically available N from an ecosystem. B) formation of nitrogen gas. C) direct formation of nitrate. D) addition of biologically available N to an ecosystem.

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