How far back does the fossil record extend?

a. 1 billion years

b. 560 million years

c. 3 million years

d. 3.5 billion years

Which of the following is not a form of natural pollution? a. volcanic ash c. forest fires b. oil spills d. all are forms of natural pollution

How long is one cardiac cycl. e? what is produced during one cardiac cycle?

Which type of animal feeds on mostly plant material?

Which cell is unspecialized? blood cell stem cell epithelial cell gamete

The wetland where a species of wading bird nests and hunts for food is drained to make way for a housing development. This is an example of A.) selective cutting B.) habitat destruction C.) conservation D.) habitat fragment

Which region of the highlighted organ prolongs and amplifies the sympathetic (emergency) response?

A medical study was investigating if getting a flu shot actually reduced the risk of developing the flu. A hypothesis test is performed. Which of the following will result in a Type I error? a.

How can a catastrophic global event influence evolutionary change? Group of answer choices Undesirable versions of genes are removed. New genes are generated. Only some species may survive the event.

Collectively called the auditory ossicles. What do you call this membrane?

Where in the cells of the leaf do you find air spaces? what is the function of stoma?