A characteristic of mutations is that they usually occur to meet the needs of a species
B)
result in different genetic sequences
are caused only by the events of mitosis
D)
do not occur at random

Patricia is told by her physician that her body and brain chemistry have physically adapted to the drug and that she has become dependent on the tranquilizers prescribed for her by another doctor.

Awater molecule is polar because there is an uneven distribution of these between the oxygen and hydrogen atoms.

Which best describes meiosis? a. it produces cells that are identical to the original cell b. it is responsible for the replacement of damaged skin cells c. it is responsible for growth of the organism d. it produces male and female sex cells