The secular trend during the last century and a half consists of a negative correlation between time and average timing of menarche.

An example of an innate human tendency is a dislike of unfamiliar stimuli

Indicate whether this statement is true or false.

Changes in part of a chromosome or in the total number of chromosomes is known as a

a. mutation. b. chromosomal mutation. c. chromosomal aberration. d. mutational aberration. e. genetic mutation.