Every normal human body cell contains how many chromosomes?

What discovery first demonstrated that color is in the eye and brain, not in the light itself?

a. Measurements of brain activity as people looked at various colors b. The inability of some people to distinguish red from green c. The chemical isolation of three types of cones in the retina d. The way a prism separates white light into several types of light

Cassandra just turned 3 years old. If she is questioned about her gender, she is most likely:

a. to still be confused about whether she is a boy or a girl b. to recognize that she is a girl and be aware that she will always be a girl c. to show evidence of acting in accordance with well-established gender roles d. to recognize that she is a girl and give some stereotyped responses about general characteristics of girls