The earliest humans used tools to
a. assist in locomotion.
b. provide protection.
c. facilitate the processing of food.
d. ward off predators.
e. construct shelters
C
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The equation, 6CO2 + 6H2O ? C6H12O6 + 6O2, describes which of the following processes?
A. photosynthesis B. light reaction C. Calvin cycle D. nitrogen fixation E. aerobic respiration
An example of a salt-wedge estuary is:
a. the Mississippi Delta. b. Delaware Bay. c. Chesapeake Bay. d. Puget Sound.
Kin selection is a form of natural selection in which ____
a. dominant individuals share resources disproportionately with their close relatives b. individuals help relatives only if they are likely to return the favor in the future c. group members sacrifice their own reproductive success to help individuals who are not their direct descendants d. shared alleles for altruism are perpetuated if the assisted animals produce more offspring than the helper could have produced if he had not helped e. shared alleles for altruism are perpetuated if the helper produces more offspring than the relatives that he aids
Respiratory proteins such as __________ in red blood cells and __________ in muscle bind oxygen and help maintain gradients that favor gas exchange.
Fill in the blank(s) with the appropriate word(s).