Why are there photosynthetic pigments other than chlorophylls?

Chlorophylls are not the only photosynthetic pigments. Chlorophyll is the most common, but there are also carotene, xanthophylls, pheophytins. They differ from chlorophyll in a light spectrum they absorb. It is known that chlorophyll absorbs red light and reflects green. That's why plants containing chlorophyll are green. However, at a depth of the sea where some plants live, there is no red light but some other light spectrum is present. Plants living in such conditions contain pigments able to absorb available light.

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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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.