Answer:
The correct answer is A) It builds fish ladders to help restore migration.
Explanation:
To solve water supply problems and to boost hydroelectricity supply, dams were invented and are still being built today.
As with every invention or technology, there are side effects and trade-offs. Some of the negative effects of dams are:
- sometimes they migration of fish
- They alter the quality and temperature of water negatively
- the flooding and or disruption of terrestrial ecosystem especially those around river banks
- alternation of the water path for rivers.
To solve the fish migration problem, fish ladders were invented.
Fish ladders are structures that connect the dammed water with the river at the lower end of the dam thus enabling them to migrate back and forth as they want for mating, breeding, and survival. Also, fish migration helps to balance the distribution of energy from marine habitats rich with them to those that need more them. Fish migration also ensures the transferring of marine nutrients and pathogens between two or more marine habitats.
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