In many dense forests, plants living near the ground level engage in intense competition for
A) oxygen.
B) water.
C) carbon dioxide.
D) sunlight.
Answer: D
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Ecologists are concerned about amphibian populations because
A. their loss would be an aesthetic loss to the planet. B. of the possibility of numerous medicinal uses. C. they are keystone species in many areas—their loss will cause other populations to crash. D. amphibians are very sensitive to environmental change—they may be indicating serious problems. E. they are increasing to the point of competing with indigenous species.
Conifer sporophytes are longer-lived, and anatomically and morphologically more complex than other gymnosperms
a. True b. False
One group of individuals of the same species in a specified area is defined as a(n) ________
a. ecosystem b. population c. morph d. variant
Saliva is a poor growth medium for bacteria due to
a. the presence of lysozyme. b. the presence of mucus. c. lack of nutrients. d. lack of available oxygen.