How could the building of a dam effect the Earth system? a. a dam could cause the flooding of a nearby forest
b. a dam could destroy a fish species that needs swiftly moving water
c. a dam could block the migration of spawning fish
d. all of the above

d. all of the above

Explanation:

All the given choices are correct reasons why the building of dams could affect the earth system.

A dam is an artificial water body made by man for specific purposes.

When a dam receives too much water, some of the storage water are released and this often cause flooding of nearby areas including forests and residential places. Also, dams affects the life of aquatic organisms. It impacts the spawning of migratory fishes and often times, there is a loss of aquatic life during dam construction.

980 is the correct answer