What concept proposes that genes associated with altruism are selected for if they lead to behavior that promotes the reproductive success of an altruist's close relatives?
a. natural selection
b. inclusive fitness
c. altruistic behavior
d. social evolution
e. instinctive sacrifice
b
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Which species of protist most closely resembles the organism in this illustration?
a. Paramecium
b. Euglena
c. Amoeba
d. A. linnaei
The membrane potential refers to the ____ across a cell membrane
a. difference in water concentration b. charge difference c. rate of movement d. distance e. difference in salt concentration
Xylem
a. involves mainly the shoot system. b. includes lignin-reinforced cell walls. c. involves the roots. d. involve stomata. e. includes pipelines that conduct water from soil to leaves.
Which of the following forms of energy was NOT involved in the production of large organic molecules in the primitive reducing atmosphere?
A. radiation from the sun B. electrical energy C. sound D. heat E. radioactivity