Text for items from 31 to 40.

1 By releasing carbon dioxide to the atmosphere,

humans are rapidly altering the chemistry of the ocean

and affecting marine life. The acidity of the ocean has

4 increased by about 25% since before the Industrial

Revolution, greater than any other time within the last

two million years. Given the speed at which humans are

7 altering ocean chemistry, marine plants and animals may

not have time to adapt or migrate as they did in the past.

Because of acidification, marine life faces a

10 two-fold challenge: decreased carbonate availability and

increased acidity. Laboratory studies suggest changing

ocean chemistry will 1) harm life forms that rely on

13 carbonate-based shells and skeletons, 2) harm organisms

sensitive to acidity and 3) harm organisms higher up

the food chain that feed on these sensitive organisms.

16 However, we do not yet know exactly how ecosystems

will be impacted.

Internet: <www.epa.gov> (with adaptations).

According to the text, judge the items from 31 to 40.