I'm taking Biology AP and I need help answering some questions about the Mechanisms of Evolution?

Question

1. The condition in which there are barriers to inbreeding between individuals of the same species separated by apportion of a mountain range is referred to as
a. geographic isolation
b. reproductive isolation

2. A number of different phylogenies have been proposed by scientists over the decades. These are useful because they
a. predict which species will evolve the most quickly in the future
b. allow us to determine when two populations that are similar evolve into separate species
c. allow us to study evolutionary relationships and evaluate the relatedness of living organisms

3.The categories in which systematists place species, in order of increasing specificity are
a. species, genus, family, order, class, phylum, kingdom, domain
b. domain, kingdom, phylum, class, order, family, genus, species

4. Which of the following constitutes the smallest unit capable of evolution?
a. An individual
b. A group
c. A population
d. A clade
e. A community

any answers help!

Answer 1

1. Geographic isolation. These populations could breed together except that they aren't in the same geographic area and can't get together to breed.

2. C

3. B The question asks for "increasing specificity" which means to go from the broadest category to the most specific category.

4. C Populations can evolve.