Which statement about a dichotomous key is true?
A dichotomous key is based on the temporary actions of an organism.
A dichotomous key may include a question that has three or more answers.
A dichotomous key may have a group with no organisms in it.
A dichotomous key is complete when each organism stands alone.

A dichotomous key is complete when each organism stands alone is the correct answer.

Explanation:

Dichotomous key helps scientists and biologists to known the identity of the various unknown things present in a natural world such as mammals, trees, fish, rocks, reptiles.

This tool is used to recognize and classify an organism based on their characteristics and it helps to provide a correct name to an organism that differentiates the organism from the other objects.

The dichotomous key identifies the individual species, objects, or organism with its scientific name.

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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