Natural selection is the process by which living things with beneficial traits produce more offspring, so their traits become more common over time.  If an animal is able to eat food easier is it more or less likely to reproduce more or less?
more

The planets further from the Sun will have bigger orbits, and therefore take longer to revolve around the Sun.  If Jupiter has a bigger orbit then Mercury, which planet will take a shorter time to revolve around the Sun Jupiter or Mercury?
Mercury

With a higher the concentration of hydrogen ions, a solution is more acidic and has a lower pH.  A small container that has 100 hydrogen ions is sitting near a larger container that has 2 hydrogen ions. The solution in the larger container is more acidic or less acidic.?
less acidic.

For example, more people on the Earth means more people contributing to global warming and pollution.  Mona lives on a planet with an unstable population. If the number of people on her planet were to increase, what would happen to global warming on her planet increase or decrease?
increase