The muscles of your lower leg are arranged in antagonistic pairs so that you
A) can both flex and extend your leg.
B) can stand upright.
C) obtain a stronger contraction than you would with a single muscle.
D) have a backup when one muscle is not strong enough.
A
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In invertebrates, such as flatworms, groups of neurons called ____ perform common functions
a. nerve cords b. ganglia c. brains d. nerve nets e. radially symmetrical
Which color of light do plants grow toward?
a) Green b) Blue c) Red d) Yellow
Marine animals that have body fluids with a solute concentration equal to that of the surrounding seawater are
A) osmoregulators. B) osmoconformers. C) hypotonic. D) hypertonic.
All of the following are correct about biofilms, except
A. they are harmless aggregations of microbes. B. they play an important role in recycling elements in the Earth. C. they are cooperative associations among several microbial groups. D. they can colonize medical devices. E. an example could be the scum that builds up in toilet bowls.