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

nitrates; cone of depression; confined; water table; unconfined; drainage field; spring.

Explanation:

Nitrogen-fixing bacteria in soil can convert excess nitrogen into nitrates, which can contaminate groundwater.

A cone of depression forms around a well when the water table begins to slope toward the well.

The water in an artesian well comes from a confined aquifer.

A well not only has to reach the water table but also has to go deeper.

Unconfined aquifers are more prone to pollution.

The two primary components of a septic system are a septic tank and a drainage field.

Groundwater that comes to the surface naturally is spring.

what are the choices for the anwser?

answer they showed that organic molecules such as amino acids could be produced from inoragnic molecules;