Which of the following statements best defines epistasis? O 1. We have epistasis when interacting genes do not show independent assortment
2. We have epistasis when identical genes produce different expression patterns in the same genotype and environment
3. We have epistasis when an allele at one locus masks the effects of one or more other alleles at the same locus
4. We have epistasis when an allele at one locus modifies the effects of alleles at one or more other loci

Animal bodies (and even plant bodies for that matter) are complex enough that life couldn't exist without enzymes. enzymes are usually large, complex biological catalysts that are expensive to make. enzymes speed up the rate of chemical reactions without being used up during the reaction (they can be reused many times). they are highly specific in the reactions they regulate. knowing what enzymes are and how they function, why does this explain why complex life forms could not exist if there were no enzymes.

Monitor and apply fix up stratorgies

In which of the following relationships is one organism always benefited while the other organism is always harmed