Type the correct answer in the box. Spell all words correctly. What happens when nutrient levels become too concentrated in rivers, lakes, and oceans?

When nutrient levels get too high, water quality degrades and oxygen levels are depleted through a process known as

Which factor contributed to the rise of african empires such as ghana and mali ? a. their creation and involvement in trade networks b. they focused only on agricultural production. c. they didn’t engage in warfare with other nations d. their geographic location protected them from attacks.