How does crossing over increase variation in a population?

Crossing over or the recombination, is the process, which involve the exchange of chromosomal segment between the non-sister chromatids in the meosis.

It creates a new combination of genes in the gametes, which are not found in the parents and contribute to the genetic diversity of the population.

Due the this the chance of survival of the offspring increases under diverse environment.

i believe the answer is a or 1

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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