Question

Drought has multiple effects on entire ecosystems. From increasing risks of forest fire to reducing harvests of crops, drought can affect plants, animals, and people. Which of these best describes how river-dwelling fish could be negatively impacted by a drought?
A) People go fishing more often when water levels are low, which increases the risk for fish of being caught.
B) They would be forced to relocate to oceans, and would not survive very long surrounded by unfamiliar predators.
C) As water levels decrease, rivers heat up more quickly, making water temperatures too high for fish and other wildlife.
D) With less water for migration and spawning, fish would be forced to move to human-populated areas, increasing risk of dying.

Answer 1

Answer:

As water levels decrease, rivers heat up more quickly, making water temperatures high for fish other wildlife.

Explanation:

This because during drought, the temperatures are so high leading to high rate of evaporation leading to very low levels of water, this way the natural habitat of fish is directly affected. The river dwelling fish are negatively impacted because the water levels are reduced and heat up faster making the water have few dissolved oxygen particles which is required for breathing by fish but since the oxygen small in quantity the fish cant survive instead they suffocate.

Also the fish can barely survive in water of high temperature because their cardiovascular system will be working at a faster rate because they are not in their comfort zone and require more oxygen to provide energy and the oxygen is not present in hot water.

Answer 2

Answer:

option (c.)

Explanation:

• Out of the four options mentioned in the question, option (c.) that is  ‘as water levels decrease, rivers heat up more quickly, making water temperatures high for fish other wildlife’ is the most apt option.
• Drought leads to high temperature and in turn leads to high rate of evaporation, high heating and less supply of dissolved oxygen into the water.
• The low dissolved oxygen impacts the respiration process of the fishes and their respiration rate increases which eventually becomes the cause for their death.