The polar ice cap melting is an event that takes place at a longer duration, and is usually measured by the end of every decade. This melting of ice caps in the polar region is caused due to the increasing amount of the earth's surface temperature. One of the main reasons is the increasing amount of carbon in the atmosphere for the last few decades.
On, the other hand, there occurs certain changes which take place in a very short time, in terms of hours or days. Some of its examples include the rise in the sea level due to the tidal effect, changing of wind direction and changing of the pressure system from low to high and vice versa.
During sexual reproduction, the genetic material of two individuals is combined to produce genetically-diverse offspring that differ from their parents. ... The genetic diversity of sexually-produced offspring is thought to give species a better chance of surviving in an unpredictable or changing environment.
