Agroup of students is asked to explain how the following diagram supports the idea that genetic mutations may arise from environmental factors. how does this diagram below support their argument?

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a.
the diagram shows how a random error in dna replication results in a point mutation.

b.
the diagram shows how crossing over results in new genetic variations.

c.
the diagram shows how changes in nitrogen bases may be passed on to offspring during meiosis.

d.
the diagram shows how uv light (photons) may cause changes in dna.