Essay. I am going to talk about evolution from a scientist prospective "im not athiest" but talking about it from religious point of view takes so long so here we go.
Every organism must struggle to survive.One reason that not all organisms survive is that there are not enough resources things that they need to go around. Organisms must struggle to get what they need to survive, competing against other organisms that want the same things they do. They also have to struggle to get away from predators and to overcome disease. For example, a fox struggling to catch a rabbit,which struggles to escape. not all of them make it. There is variation within a species.Not all of the individuals in a species are exactly the same. There are variations differences, among members of a species. If you look at the spots on several different ladybugs or the stripes on zebras you will notice that they don't all have the same number or arrangement of spots or stripes.
In addition to these easily visible variations, there are differences in skill and behavior, such as differences in how fast the zebras can run. If organisms were all the same none would be better suited than any other and selection could not occur and we would have to many animals to populate the earth. Some variations allow members of a species to survive and reproduce better than others.If an organism has a trait that helps it survive or reproduce, it is more likely to survive and be able to reproduce. A faster cheetah is more likely to catch a gazelle and survive, and a faster gazelle is more likely to escape the cheetah and survive. A showier flower is more likely to be noticed by a bee, which enables it to reproduce. A thornier cactus is more likely than other cactuses to be left alone by animals, rather than be eaten and die see where im going with this.Organisms that survive and reproduce pass their traits to their offspring, and the helpful traits gradually appear in more and more of the population.Most of an organism's traits are passed on to its offspring. If more of the organisms with the helpful trait survive, then in the following generations, more and more of the population have that trait. If there are some faster cheetahs and some slower cheetahs, the faster cheetahs will be better able to catch food and survive. With more of the slower ones dying before they can reproduce, and more of the faster ones surviving and reproducing, over generations the population on the whole will gradually become made up of faster cheetahs.
this is where we get on enviormental change and its role in evolution.Environmental change and isolation of groups of organisms play an important role in evolution. Environmental change is any change in an environment to which an organism must adapt. Change can be gradual, such as when mountains or deserts form, other species die out, or new species evolve. These things can take millions of years. Change to an environment can also be quick, such as floods, volcanoes, or earthquakes. It can also be caused not by change to the environment itself, but by the organism's movement to a different environment.Change in an organism's environment forces the organism to adapt to fit the new environment, eventually causing it to evolve into a new species. For example, if a species of animal is mostly limited to eating one kind of leaf, and a change occurs: a fungus attacks and kills most of that kind of plant, the animal has to evolve either to fight the fungus or to eat something else. 
Environmental change is any change in an environment to which an organism must adapt. Change can be gradual, such as when mountains or deserts form, other species die out, or new species evolve. These things can take millions of years. Change to an environment can also be quick, such as floods, volcanoes, or earthquakes. It can also be caused not by change to the environment itself, but by the organism's movement to a different environment.
This is where we get in to natural selection To me, the meaning of the term natural selection is most simply illustrated by an example. About one in 400 black people worldwide have sickle-cell anemia which is caused by inheriting two copies of a recessive gene that makes those with one copy of it about 1 in 12 black people worldwide resistant to malaria According to Endler in the seventeenth century, Dutch slave traders introduced people from a single area of West Africa at random into two regions: Curacao which had no malaria and Surinam which had malaria. Today, the descendants in Surinam have a significantly higher sickle-cell frequency than do those in Curacao.
Natural selection occurs in animal to http://en.wikipedia.org/wiki/Adaptation
http://www.pbs.org/wgbh/evolution/
http://evolution.berkeley.edu/
http://en.wikipedia.org/wiki/Natural_selection
http://images.google.com/images?svnum=10&um=1&hl=en&rls=com.microsoft%3Aen-US&q=black+person
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