The ability to extend a leg is the result of
a. contraction of ligaments and tendons.
b. contraction of a muscle.
c. lengthening of a muscle.
d. a combination of push and pull by antagonistic muscle pairs.
e. relaxation of myosin and actin proteins.
B
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A disease-causing microorganism or virus is referred to as a(n)
A. avirulent infection. B. colony. C. commensal. D. pathogen.
The process of denitrification involves the transformation of ________.
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