___________________ are organisms that derive energy from sunlight
A. Phototrophs
B. Autotrophs
C. Heterotrophs
D. Chemotrophs
E. Lithotrophs
Answer Key: A
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The assumption that there was little free oxygen in
the earth’s first atmosphere is supported by evidence derived from the study of a. ancient iron-containing rocks. b. the ancient atmosphere. c. oceanic sediments. d. moon rocks that formed at the same time as the earth. e. none of these.
Cyclic electron transport is different from noncyclic electron transport in that cyclic electron transport produces
NADPH. __________________ Indicate whether the statement is true or false.
Which gas was the least abundant in the earth's atmosphere 3.5 billion years ago?
A. oxygen B. nitrogen C. carbon dioxide D. carbon monoxide
________ meiosis occurs after fertilization.
Fill in the blank(s) with the appropriate word(s).