Which statement is true with regard to mutations?
A) ?Mutations are always harmful.
B) ?Mutations always provide for beneficial changes in an organism's genetic makeup.
C) ?Mutations are chosen by the organism to improve their survival.
D) ?Mutations that survive in a population are determined by natural selection.
E) ?Mutations are caused only by harmful chemicals.
Ans: D) ?Mutations that survive in a population are determined by natural selection.
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Stretch-sensitive muscle spindles are indicated by the letter _____
a. A b. B c. C d. D e. C and D
A taxon that includes all the descendants of an ancestor is called:a
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Fill in the blank(s) with the appropriate word(s).