Salt concentration is the factor among the following factors given in the question that does not vary between a fast flowing river and a pond that receives no water input. The correct option among all the options that are given in the question is the second option. I hope the answer comes to your help.
Answer:
<h2>Humans and wild animals face new challenges for survival because of climate change. More frequent and intense drought, storms, heat waves, rising sea levels, melting glaciers and warming oceans can directly harm animals, destroy the places they live, and wreak havoc on people's livelihoods and communities.</h2>
Explanation:
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A. Deposition, erosion is the sediments actually moving and weathering is the wearing down and breaking of the sediment.
The correct answer for the question that is being presented above is this one: "b. has a much lower rate of primary productivity." Compared to an ecosystem with just a single stage of succession, an ecosystem with a variety of successional stages <span>b. has a much lower rate of primary productivity.</span>
Evolved from past organisms hope this helps!!!!