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Natural selection is the process in which org4nisms that are better
adapted to their environment are more jikely to survive and produce more
ofRSpring. No environrmnent is perfect for every species. OBere are always
jamits on available food, water, and space, as well as the.frequent threat of
being attacked. @Pving thimgs always have to compete for resources and
haye thus developed different mechanisms for survival Ke) Species that are
more able to adapt to enyironmental pressures oyer time have a higher chance
of survival @中 is believed that all animals can be traced back to a single
common ancestor. The changes caused by natural selection do not happen
| overnight 一 sometimes it can take a milion years for a change to take hold jm
aspecies, Natural selection js sometimes caled "survival of the fttest' and it
is the driving force behind the theory of evolution.
