In the intellectual movement known as ________ what is called “truth” is relative to a particular historical period or culture.

In a correlational study,

a. only the independent variable is manipulated. b. only the dependent variable is manipulated. c. no variables can be manipulated. d. there are no dependent or independent variables as such. e. there are no confounding variables.

At the beginning of the embryonic period, the __________ system develops fastest

A) circulatory B) endocrine C) digestive D) nervous