The autumn days shorten and get colder. the leaves lose their normal green color and turn red, yellow, and brown. this color change is the first sign of as winter approaches.

There are six elements that make up most of the human body. which of the following is not one of these six elements?

What process allows for the development of haploid sex cells? mitosis meiosis fertilization pollination

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .