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A frog eating an insect is a

Areas with an unusually high concentration of species.

Parasitism, predation, and competition are density independent factors that help control population size.

A snake eats a mouse that has fed on corn. What is the mouse?

The pH of the stomach is usually about:

Wetland dominated by trees.

Which of the following is NOT an organ of digestion?

Eats both producers and consumers.

Approximately how far does a red blood cell travel in the bloodstream before it is worn out and is removed?

What would cause you to believe that someone has a heart murmur?