If all of Earth's history were compressed into an hour, humans would first appear less than
A) 1 second ago.
B) 10 seconds ago.
C) 1 minute ago.
D) 10 minutes ago.
Answer: A
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On a short-term basis, water loss in plants may be controlled by the
A. bending of the petioles on the leaves. B. closing of the stele in the roots. C. closing of the stomata in the leaves to limit transpiration. D. opening of the stomata in the leaves to allow more carbon dioxide to enter. E. opening the Casparian strips in the roots.
The principle of comparative advantage is associated with
a. restricting consumer choices. b. greater production at higher prices. c. specialization and exchange. d. comparing the efficiency of alternative tariffs.
In panel "A", what is being injected into the host cell?
a. enzymes b. the viral protein coat c. nucleic acids d. ribosomes e. the viral envelope
Exponential growth occurs
A) only in laboratory populations. B) only in theory, never in actual populations. C) frequently in natural populations. D) only for a limited time in natural populations. E) at regular intervals in natural populations.