Evolution is a process by which lineages of organisms change. The origin of
species is part of the evolutionary process, but there are other aspects as well.
Evolution can occur without new species arising.
For evolutionary trees, a "node" is a point in a tree, from which two or more
"branches" emerge, eventually leading to "tips" representing a single group.
All true. Get comfortable with the terminology.
Gene flow between two populations of a species usually impedes speciation.
If the two populations interbreed, the intermingling of genes prevents each
population from diverging from the other.
Hardy-Weinberg equilibrium arises only when random mating and several
other conditions apply within a population.