Answer:
I think that birds have different bill lengths because of their habitats and their diet. Also natural selection and evolution has also played a factor due to the fact that birds have not always looked the way that they do now, for example the Archaeopteryx a bird that lived around the time of the dinosaurs had a shorter and more powerful bill to grind insects and small mammals
Explanation:
<span>taken or considered over a short time period; short-term.</span>
Natural variation provided the phenotypes that natural selection then acted on, over time causing evolution
Answer:
Huntington's disease
Explanation:
becase it is are caused by dominant alleles of a single gene on an autosome. Changes in chromosome number can lead to disorders like Down syndrome.
The answer is C. Population size
