A buffer solution is made up of a weak acid and its conjugate base or a weak base and its conjugate acid. The two components maintain a pH balance that resists change when strong acids or bases are added to it.
Survival of the fittest. The strongest offspring will survive to adulthood and reproduce - their offspring will have stronger genes than prior generations. The weaker offspring will not live to adulthood and not produce offspring, therefore the weaker traits will die out with each generation
The water is a lot cooler than the land or beach/sand
These types of nerves are called "Sensory Neurons" :)
Archaebacteria move by using the form of a flagellum to propel a themselves.
hope that helps