Resistance activities increase muscle mass by ____
a. stretching muscles
b. increasing the number of mitochondria in cells
c. encouraging the synthesis of more actin and myosin filaments
d. encouraging the production of more muscle fibers
e. converting red fibers to white fibers
ANSWER: c
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Most of earth's fresh water is _____
a. in lakes and streams c. frozen as ice b. in aquifers and soil d. in bodies of organisms.
Biologists generally classify animal behaviors by
A. both the way the organism acquired the behavior and how changeable the behavior is in the organism. B. the way the organism acquired the behavior. C. the number or proportion of the species that displays the behavior. D. how specific or general the behavior allows the organism to interact within its environment. E. how changeable the behavior is in the organism.
Every ecosystem must have _____
A) autotrophs and heterotrophs B) producers and primary consumers C) photosynthesizers D) autotrophs
The 14 species of Darwin's finches on the Galapagos Islands mainly differ in:
a) body size. b) tail length. c) song type. d) coloration. e) bill size.