You are studying runoff from fertilized fields that carries nutrients, such as nitrogen and phosphorus, to lakes in your area. you notice that runoff stimulates such an excessive growth of algae that its natural community interactions are disrupted. you can easily account for nutrients necessary to stimulate algal growth, but where do they get their energy?

They get energy from sunlight

Explanation:

Algae are autotrophs as they have green colored pigment called chlorophyll which helps in the process known as photosynthesis.

With the help of sunlight, carbon dioxide and other nutrients available in water aids in photosynthesis.

This process provides energy to algae for its growth and metabolism. As producers an make their own food they are dependent on photosynthesis for their energy.

you are certainly talking about this picture:

a: is the label of the white square, it is showing the  replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication 

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes  the dna with the dna template and increases  the processivity of the enzyme. ==>   stops polymerase from falling off the  template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built  in the opposite sense of the helicase, so dna will be built in fragments ==> built  fragments from 5' to 3 joins

and finally f: is the enzyme that builds  the new dna strand (dna polymerase) ==>   adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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your answer is "the 1950's"