C)set maximum contaminant levels for pollutants in drinking water
29. B
30. EXO means your EXporting it out of the cell so the answer would be C
"(1) Human population growth reached 6.8 billion in 2010 and it continues to increase" is what led to the other <span>three, since all of these happen from human activity. </span>
Primary consumers enrich the soil,which help plants to grow and create more food energy for all of us.
Cartilage connects the sternum and ribs. There are 7 true ribs, 3 false ribs, and 2 floating ribs. They are all connec
ted to the sternum using cartilage.
