Name two parts of the water cycle in which contaminants can be introduced.

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

Sickle cell amelia is a condition condition where the red blood cells are deformed which is affected by sickle cell amenia

What happens to the amount of waste in the pond as the ecosystem ages?