An ecological niche is an organism's specific habitat in an ecosystem.
It is where it lives and feeds, etc.
Biogeographic isolation : Isolation through distribution of Species in geographic space and time
so , one of the answer is The isolation of two populations of the same species
By doing this, decrease the chance of any cross breeds between species, which eventually will led to Speciation
Abiotic and biotic factors
The answer is C) chromatophores.
