Question

dissolved oxygen:
how does dissolved oxygen affect living organisms in the river?
a. low dissolved oxygen makes it easier for fish and insects to survive.
b. dissolved oxygen has little effect on the types of organisms that live in the river.
c. high dissolved oxygen levels are harmful to most types of organisms.
d. low dissolved oxygen levels make it difficult for fish and aquatic insects to survive.
choose your
answer below!
81 % (score)
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Explanation:

To determine the correct answer, we analyze each option:

• Option A: Low dissolved oxygen would stress aquatic organisms, not make survival easier. Eliminate A.
• Option B: Dissolved oxygen is crucial for aquatic life (e.g., respiration), so it has a significant effect. Eliminate B.
• Option C: High dissolved oxygen is generally beneficial (supports more life), not harmful. Eliminate C.
• Option D: Fish and aquatic insects need dissolved oxygen for respiration. Low levels limit their ability to get oxygen, making survival difficult. This matches biological principles.

Answer:

D. Low dissolved oxygen levels make it difficult for fish and aquatic insects to survive.