Aquatic organisms can be found throughout fresh and salt water environments at almost all depths. Although, most living things are found in the zones that have the greatest light penetration. Which of these is the most important reason why light penetration is essential to aquatic life?
A) Light energy heats the water and most fish are cold blooded.
B) Light energy is the foundation of the food webs within the aquatic ecosystem.
C) The organisms need to be able to see to hunt.
D) Fish need to see others of their species for reproduction.
Ans: B) Light energy is the foundation of the food webs within the aquatic ecosystem.
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