10-12 percent

25 percent

less than one percent

more than fifty percent

forests

gardens

rainforests

deserts

tropical waters

waters around the South pole only

sub-tropical waters

A and C

Accumulation of calcium carbonate

Action of wind erosion

Erosion of volcanic rocks

Deposition of iron oxide

Lack of sunlight and nutrients

Climate change, ocean acidification, overfishing, pollution, and destructive fishing practices

Deforestation and land development

Excessive coral reef tourism

10 -15%

20%

45%

25%

oil spills

warmer water temperatures

overfishing

red tide

Ocean ecosystems have great diversity.

Fishing methods are upsetting the balance of the ecosystem

Animals are using the branches to hide.

Water pollution also damages water.

Yes, but only with our help

No, they are dead

Maybe, it depends on future events

climate change

overfishing

pollution

all of the above