Main ing over is related to variation.

Answer and Explanation:

Variation refers to the differences among living organisms. Some of the variations are shown in tongue rolling, fingerprints, height and weight. Variations can be categorised into two types; discontinuous and continuous variations. Variation in the physical appearance of organisms is caused either by genetic, environmental factors or a combination of both.

During gamete formation, crossing over would occur. during prophase 1 of meiosis, homologous chromosomes pair to form bivalents. The chromatids of bivalents form intimate contact points called chiasmata. At the chiasma, breakage may occur and exchange of chromatids segments between non-sister chromatids may take place. This is called crossing-over.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

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