Nitrogen-fixing bacteria in soil can convert excess nitrogen into , which can contaminate groundwater. A/An forms around a well when the water table begins to slope toward the well. The water in an artesian well comes from a/an aquifer. A well not only has to reach the but also has to go deeper. aquifers are more prone to pollution. The two primary components of a septic system are a septic tank and a/an . Groundwater that comes to the surface naturally is known as a/an .

20. in humans, freckles are dominant to no freckles. trey has no freckles and his wife anna grace has freckles, but her dad doesn't. they want to know what percentage of their kids would look like trey. show a punnett square to support your answer.

After frida stops exercising, she continues to breathe heavily. what is most likely occurring in her body? heavy breathing during exercise has produced an oxygen surplus in her muscles. this oxygen is being transported to her lungs. this is a result of aerobic respiration. heavy breathing during exercise has produced a carbon dioxide surplus in her muscles. lactate is being transported to her liver. this is a result of aerobic respiration. strenuous exercise has caused her body to be in carbon dioxide debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration. strenuous exercise has caused her body to be in oxygen debt, and she is breathing hard while lactate is transported to the liver. this is a result of anaerobic respiration.

When the body has a weakened immune system, the production of antibodies is increased.