Abird builds it's nest on a tree branch. this relationship between the bird and the tree is an example of? a. competition b. commensalism c. mutualism d. parasitism

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .