The main driving force of the Earth’s ocean
currents is
a. the tilt of the Earth on its axis.
b. differences in the ocean depths.
c. differences in temperature at different parts
of the ocean..
d. relative amount of landmasses versus
amount of ocean.
e. the prevailing winds.
C
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The human ancestor whose populations dispersed from Africa to other parts of the world was
(a) Homo sapiens (b) Australopithecus afarensis. (c) Pan troglodytes. (d) Homo erectus.
The basic unit of ecology is the individual because it
A) is the basis for ecosystems. B) is the unit on which natural selection acts. C) cannot be further reduced to smaller parts. D) passes genetic information to successive individuals.
Chlamydomonas is unicellular and photosynthetic. Chlamydomonas is which of the following?
A. a slime mold B. an apicomplexan C. an amoeba D. a protozoan E. a green alga
Hormones as a general class are chemicals produced by the endocrine system that
A) control embryonic development. B) regulate a variety of body functions, such as metabolism. C) are stimulated by the action of metabolic enzymes. D) travel by specific pathways to specific target cells.