Question

scientists discover that run off from some plant fertilizers can produce algal blooms that negatively affect ocean systems. which of the following options provides evidence of how algal blooms harm ocean ecosystems? (1 point)
authorities warn the public not to let their dogs swim in water bodies with algal bloom since they could get sick from algae exposure.
rainfall and irrigation can cause excess water to enter the soil, resulting in excess fertilizer runoff that ends up in the ocean.
excessive nutrients from fertilizer runoff increase the amount of plant and algae growth and water bodies.
large algal blooms rapidly decompose, contributing to increased carbon dioxide and low oxygen water that can reduce fish habitats.

Explanation:

The question asks for evidence of how algal blooms harm ocean ecosystems. The first option is about dogs getting sick, not ocean ecosystems. The second option is about how fertilizer runoff reaches the ocean, not the harm of algal blooms. The third option is about the cause of algal blooms, not their harm. The fourth option describes how large algal blooms decompose, leading to increased carbon - dioxide and low - oxygen water which reduces fish habitats, thus harming the ocean ecosystem.

Answer:

D. Large algal blooms rapidly decompose, contributing to increased carbon dioxide and low oxygen water that can reduce fish habitats.