The right answer is "cross" or "cross pollination" or "cross-pollination"
Cross pollination
The Grants' work shows that variation within a species increases the likelihood of the species' adapting to and surviving environmental change.
Maybe, Have more sexual intercourse. fragmentation
Variation of a species can come about in many ways, but mutation is the major cause of variation in a species.
Of course, variation exists within individuals of the same species. This is because there are a small minority of genes which have multiple alleles in most species. In cases where a subset of the population is isolated from the rest of the population, a subspecies may develop which has particular unique characteristics but can still interbreed with the rest of the species.
dna cloning
The Grants' work shows that variation within a species increases the likelihood of the species' adapting to and surviving environmental change.
The differing traits provided by variation mean that at least some groups of the species may be better prepared to survive.
Maybe, Have more sexual intercourse. fragmentation
Human species, as in the variation in height.
Variation of a species can come about in many ways, but mutation is the major cause of variation in a species.
Within a species, the animals breed together so that the similar characteristics are passed from parents to their offspring. This is why there is less variation within a species than between a species.
Variations occurs in species due to the process of "Crossing over"
variation
sexual reproduction
It has adaptations
Variation exists within the genes of every population or species as the result of natural selection. The other reason is due to neutrality of mutations.
Because there is variation within a species, it is therefore possible for the law of natural selection to operate, by selecting those variations which best enhance survival and reproduction.