In the troposphere,

a. air pressure stays the same as altitude increases.

b. air pressure increases as altitude increases.

c. air pressure decreases as altitude increases.

d. air pressure alternately increases and decreases as altitude increases.

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Since 1980, which three countries have either attacked or been attacked by iraq? a. iran, turkey, united states b. iran, israel, jordan c. iran, kuwait, united states d. iran, saudi arabia, egypt

Is a state government creates a new tax to fund schools a example of checks and balances