Carbon first becomes part of a living thing as a result of
A. nitrogen-fixing bacteria.
B. decomposer organisms.
C. photosynthesis.
D. aerobic respiration.
C. photosynthesis.
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Electron microscopes resolve details __________
times smaller than can be seen by a light microscope because electrons travel in wavelengths 100,000 times shorter than those of visible light. a. 100,000 b. 90,000 c. 75,000 d. 60,000 e. 50,000
The ancestor of humans is commonly thought to be
A. Australopithecus boisei. B. Australopithecus anamensis. C. Australopithecus africanus. D. Australopithecus afarensis.
The ____________ consists of a series of changes the cell undergoes from the time it forms until it ____________ .
Fill in the blank(s) with correct word
__________ are the specialized reproductive structures of angiosperms.
Fill in the blank(s) with the appropriate word(s).