What could lead to a population of a species living in two different environments?

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.

Cells must be in osmotic equilibrium with their surroundings environments because if they swell or shrink thier membranes will rupture