Реферат: Evolution Essay Research Paper We actlike animals

could not equal the geometrical rate of population growth. In addition,

limitations such as famine, disease, or war, play a major role in deciding the

population growth. With this proposal, Darwin quickly applied Malthus’s

proposal in circumstances of plants and animals. In 1838, Darwin designed a

projection of a theory of evolution through natural selection.

Natural selection is a process in which the organisms suited best for their

environment tend to reproduce the most and leave the most descendents. With the

limitation of food for each species, competition is formed in which all livings

beings must compete for the supply of food, water, space, and other resources.

Individual plants and animals whose adaptations of suited best for a certain

environment tend to have an advantage in the competition for survival. Species

with this advantage tend to leave a larger number of offspring than the less

fortunate species. As a result, the size of the species which is best adapted

to its environment increases from generation to generation. The term fitness

refers to the ability of an organism to reproduce. Scientists use this term to

create the concept "survival of the fittest." Natural selection

contains the ability to affect an individual’s ability to reproduce. These

abilities consist of appearance, body chemistry, physiology, and behavior.

Physiology is how an organism functions. In order for natural selection to

function properly, two biological requirements must be encountered. One,

individuals of a population require difference in their hereditary

characteristics. An example of the requirement for difference in their

hereditary characteristics, human beings differ in almost every aspect of their

appearance with include height, weight, and eye-color. In addition, humans also

differ in brain size, thickness of bones, and the amount of fat in their blood.

Secondly, for natural selection to function properly, some of the inherited variations

must affect chances for survival and reproduction. As a result, the fittest

individual tends to pass on more duplications of their genes to their offspring

than the less fittest individuals. In the later periods of time, a species