How does climate change lead to an increase in algal blooms? a. decreased temperatures lead to an increase in phytoplankton growth. b. increased levels of carbon dioxide, a greenhouse gas, leads to increased phytoplankton growth. c. increased pollution leads to lower levels of nutrients in aquatic ecosystems and therefore an increase in phytoplankton growth. d. decreased water levels caused by climate change lead to an increase in phytoplankton growth.

b. Increased levels of carbon dioxide, a greenhouse gas, leads to increased phytoplankton growth.

Explanation:

The air contains huge amount of toxic pollutants such as carbon dioxide, carbon monoxide and greenhouse gases which are responsible for raising the global temperatures. These gases get mixed with the water body. Some gases like carbon dioxide and other greenhouse gases mixed with the molecules of water and forms organic matter which is necessary for the growth of underwater plantation or growth of the algae or phytoplanktons in the water body.  This phenomena is called as eutrophication. This will deplete the amount of oxygen in the water hence, will cause the decline in the population of aquatic animals in the water body.  

On the basis of the above description, climate change will lead to an increase in algal bloom this will b. Increased levels of carbon dioxide, a greenhouse gas, leads to increased phytoplankton growth.

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the independent variable, or the one that is intentionally manipulated is the speed.