Approximately how long have homo sapiens been on earth, according to the fossil record?

What effect does prenatal exposure to high levels of testosterone have on the development of female rats?

The part of Earth in which life exists, including land, water, and air

Which of the following types of cells is not found an epithelial tissue A) endocrine gland cells B) exocrine gland cells C) adipose cells D) squamous cells

Which of the following would NOT be illegal under the Endangered Species Act? A) capturing a wild animal listed as a threatened species for exhibition in a zoo, provided the animal was well cared for B) destroying the habitat of an endangered plant

During the cell cycle,

Made when sediments fill in a cavity made when an object decayed and the sediments harden into rock

The lemming is a small mammals with a very high daily energy expenditure for its size. Based on what you learned in the panda case study, what would you predict about the lemming?

You started out as a single cell and are now made of over 200,000 different types of cells. explain how this happens.

why is carbon such an important element in living organisms

Which of these is a fiber - yielding crop?