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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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.
Biology & Microbiology
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
Biology & Microbiology
Blastomyces dermatitidis occurs in the (eastern/central/southwestern/western) part of North America
What will be an ideal response?
Biology & Microbiology
The infectious agent that causes AIDS is a
A) virus. B) bacterium. C) yeast. D) protozoan. E) mold.
Biology & Microbiology