Multiple Choice Question
The picture shows an algal bloom.
When toxic cyanobacteria takes over an aquatic ecosystem, it collects and forms a thick carpet near the surface. This is called an algal bloom. The microorganisms in an algal bloom block the light from the Sun but still absorb its heat. Which argument MOST LIKELY describes the effect of an algal bloom on an ecosystem?
A.
The temperature of the water will increase the number of food sources for marine life.
B.
Plants in the water will not receive enough sunlight and their populations will decrease.
C.
The temperature of the water will become too cold for marine life to be able to survive.
D.
Plants in the water will receive extra nutrients from sunlight and their population will increase.