Man made carbon dioxide comes from the burning of fossil fuels. An example of a fossil fuel is

Question 1 options:

A) wood


B) shale


C) oil


Question 2:
Ocean acidification begins with

Question 2 options:

A) pollution from ships


B) dumping of waste from cities into the ocean


C) carbon dioxide released from combustion


Question 3
Very slight increases in the acidity of seawater __________ marine organisms that make shells.

Question 3 options:

A) doesn't bother


B) is unhealthy and stresses


C) has no effect on