Term Papers on Evolution

Term Paper Title	Evolution
# of Words	634
# of Pages (250 words per page double spaced)	2.54

Evolution

In this essay I will talk about the theory of evolution. The term evolution
means a gradual change over time. There are two types of evolution. The first
is geologic evolution, which is the very slow change of the earth over a long
period of time. The second is organic evolution, which is the slow process by
which species change over a long period of time. The fossil record is
basically the history of life based on fossils found. A fossil is the remains of
an organism that lived at an earlier time. When insects are found they usually
are surrounded by amber. Amber is a yellow, sticky substance that hardens
over a period of time. When an insect get stuck in the amber, it hardens and it
is preserved. Petrifaction is when the remains of an organism is turned to
stone. Some fossils are petrified replicas of the first one.
Sedimentation is when any organism that has turned into a fossil, becomes
sedimentary rock and becomes a part of a layer on the earth. The youngest
fossils would be found at the top layer, and the oldest fossils would be found
at the lowest layer. Imprints are impressions made on the ground by an
organism. The imprint may remain if the surface turns into rock. A mold is a
hollow rock that has the remains of an organism inside it. The cast comes
from hardened minerals, that forms a copy of the original organism.
Comparative anatomy is the study of structural similarities and differences
among living things. It offers evidence that species have evolutionary
relationships. Homologous structures are parts of organisms that have similar
structures and similar embryological development, but have different forms
and functions. For example, a human hand is used for grabbing things, while a
cats limb is used for walking.
Comparative cytology is when cell organs, like the cell membrane,
ribosomes, mitochondria, are similar in organisms of all types. Comparative
embryology is that comparison of different species while they are still in
embryological form. This can provide evidence of evolution...

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