What is the genetic phenomenon referred to as when two mutant strains can have offspring that have a wild-type phenotpe?

Complementation

Explanation:

Complementation is a genetic phenomenon where two strains of a mutant strain have offspring that have a wild-type phenotype. Complementation will occur only if the mutations are in different genes. Each strain on the gene supplies the wild-type an allele to complement the mutated allele of the other strain's genome. Since the mutations are recessive, the offspring will display the wild-type phenotype.

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for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.