____ is stiffening of muscles, which makes the body feel rigid.

The term ________ means "the study of internal and external structures and the physical relationships between body parts."

A) anatomy B) cytology C) physiology D) ornithology

Melting is a physical change of a substance:

A) from solid to liquid. B) from liquid to gas. C) from solid directly to gas. D) directly from a gas to a solid.