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Three changes are probably global temperature change(Ice Age,NOW), and...nothing else. This is most likely the only environmental change that affects evolution.
Divergent
Divergent Boundary
The main event that occurs at a divergent boundary is major dick sucking and also little events like you have a small pinner.
Three structures that are most likely found in all fish are: gills, fins, and blood.
Evolution works by tinkering with what is already there. It is far more likely that an advantageous change to an existing structure can occur than a gross change providing an advantage. An example would be the transition from fishes to amphibia. Small incremental modifications to fins to provide some of the functionality of walking limbs are far more likely to occur than limbs suddenly sprouting from a body where there was nothing there before, which would be nigh-on impossible.
biological evolution
The latter isn't primitive. Most likely it means 'non trivial', 'adaptive' or 'sophisticated'.
The garbage bin
Oligopoly
It's called convergent evolution. Where two species that are separated by a barrier evolve similar structures or behaviors. This is because they most likely live in similar environments that cause them to adapt similar features to survive in that particular environment.
It is very likely that the next step in human evolution will look just like it does now. It will not be for a long time.