During gastrulation, three tissue layers form: the outer __________, the inner __________, and the __________ in between the first two layers.
Fill in the blank(s) with the appropriate word(s).
ectoderm; endoderm; mesoderm
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The earth spins
a. fastest at 60 degrees latitude. b. fastest at the equator. c. fastest at 90 degrees latitude. d. fastest at 30 degrees latitude. e. at an equal speed at all points.
Cellular respiration starts in the cytoplasm with the process of
a. glycogenolysis. b. gluconeogenesis. c. glycolysis. d. the Krebs cycle. e. the Citric Acid cycle.
HIV-infected blood may be present on all of the following EXCEPT
a. toothbrushes. b. razors. c. needles used to inject drugs. d. contaminated medical equipment. e. toilet seats.
The process by which new species originate
A. is germination. B. is extinction. C. occurred only once in Earth's history. D. is speciation. E. occurred for millions of years but is no longer occurring.