[u2-l2] two birds that look very similar to each other have always been considered two distinct species based on differences in their body size and in where they live. a group of ornithologists studying the two species begins to think they might not be separate species based on observed behavior. what would be the best next step regarding this new hypothesis?

The correct answer is testing of their DNAs.

Explanation:

In my opinion, the next step considering the mentioned hypothesis in the question is to perform DNA examinations on the two species in order to observe how genetically identical they are.  

Prior to making any kind of conclusions, like publishing the ideas in a scientific journal, there is a need to ensure that the hypothesis is correct. Thus, comparing the DNAs of the two birds in order to access their similarities and differences would be an ideal way to test the hypothesis.  

parasites can detrimentally affect their host, but also must not allow their host to die before they can complete their life cycle. some parasites have complex life cycles with many different hosts, and have had to find ways of persisting in many different environments during the change from one host to another. ectoparasites live outside the body of the host, and can more easily  disperse, but are  more exposed to predators, parasites, parasitoids. endoparasites live inside the body of the host, and are therefore protected from the outside environment. but they can be  attacked by the host's immune system. they have therefore developed  mechanisms for dispersal such as  complex life cycles.

the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.