Which condition in the ocean is most responsible for an increase in the fish population near the surface?

How is the deep ocean floor different from the shallow parts of the ocean near land?

Which of these organisms is a producer in a marine ecosystem?

What is a possible effect of high nutrient levels in water systems?

Which of the following are indicators of a healthy water source?

Which of the following water pH levels is best for marine organisms?

Which bes describes the characteristics of a river basin?

Which of the following occurs when algae decompose in the ocean?

A drop in dissolved oxygen during the summer is most likely due to:

An algai bloom in a water system is most likely caused by:

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