Answer:
D. introduce new predators to an environment
438 is the estimated population based off the current population growth trends.
I did my research on this question. It would be... D
Fresh water and salt water together cover 3/4 of the earth's surface.

The processes that take place on or near the surface of the earth that makes the surface wear away. They cause degradation and wearing away of the Earth's surface.
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- The main types of exogenic processes are weathering, mass wasting, erosion, sedimentation.
- Weathering is the breaking down of rocks to form soil. They can be physical, chemical or biological.
- Erosion is the transportation of rock debris by geomorphic agents like running water, the wind, waves etc.
- Deposition is the end result of erosion.
- Sedimentation is the process of leaving sediment anywhere because of larger mass at the bottom level.