Problem : Describe a coevolutionary arms race.A coevolutionary arms race takes place in a predator-prey relationship when the prey evolves a new defense or the predator evolves a new offense. Each species will evolve a new trait to give them an advantage over the other. When this process occurs with several new adaptations over a short period of time, it is known as a coevolutionary arms race.
Problem : Why is coevolution difficult to prove?Coevolution is difficult to prove because it requires direct evidence of not one but two species evolving together.
Problem : What do most biologists accept as evidence for coevolution?Most biologists will accept coadaptation as proof of coevolution in the absence of evidence to the contrary.
Problem : What might be another explanation of coadaptation?Coadaptation may arise from coevolution, the development of traits in two species in direct relation to each other. However, coadaptation may also occur as a result of two species developing traits independently of each other that then happen to make the species well adapted to each other.