Are you sure you want to delete this answer? Yes Sorry, something has gone wrong. It is NOT a good thesis statement because the two sentences contradict each other! In fact, the second sentence doesn't have to do with evolution at all!
Niles Eldredge Species vs. Time In this example, a snail species, A, is isolated by a geographic barrier to form subspecies X and Y. Eventually, this geographic separation leads to genetic isolation, and two distinct new species, B and C, form. Do most anatomical changes occur during these events? Or can species evolve as single lineages?
And how long does it take the process of speciation to work in geological time? This assumption underlies the concept of the "molecular clock": According to this view, even when lineages divide, the slight differences between the newly separate species will tend to grow steadily and gradually increase over time [Figure 1].
Fossils tell a different story The fossil record indicates otherwise. New species tend to appear in the fossil record already morphologically distinct from their closest relatives.
And once established, species tend not to change significantly or permanently, which in the case of marine invertebrates can amount to a 5-million-year or even million-year history without change.
The birth of a new theory: Along with many other species of trilobites, mollusks, brachiopods, corals, and other invertebrates, the abundant Phacops rana inhabited the shallow-water inland seas that ran from the present-day Appalachian mountains as far west as Iowa.
North America lay astride the Equator in those days, and its shallow tropical seas literally teemed with life that has left a rich and dense fossil record.
The fauna persisted for some 6 million to 8 million years. Phacops rana A fully articulated trilobite and a well-preserved trilobite head from Dr. Collecting all over the Midwest and up and down the Appalachian mountain chain over several summers, I was dismayed to detect no obvious evolutionary change across 6 million years and thousands of miles.
Finally, I stumbled on some changes: Back in the laboratory at the American Museum of Natural History, where I was privileged to work as a Columbia University graduate student, I carefully removed the rocky matrix covering my specimens and began to measure and examine the trilobites.
Having learned from another paleontologist that the lenses of the eyes of these kinds of trilobites are arranged into vertical columns holding anywhere from one to more than 15 large, bulging lenses, I counted the lenses on each specimen.
One day I suddenly realized that samples from different localities—different places in both time and space—differed mainly in the number of those vertical columns of lenses. Babies would add columns, then stop at the "mature" number:Thesis Evolution: Writing a Strong Thesis Statement I.
Why is the thesis so important and what is its function? A thesis states the writer's clearly defined opinion about a particular subject or issue. Thesis Charles Darwin's Theory of Evolution is the best evolutionary theory in history.
This is true because Darwin was the one who came up with the basics of evolution such as natural selection and had proven those basics to be true.
Theistic evolution, Supporters of theistic evolution generally harmonize evolutionary thought with belief in God, rejecting the conflict thesis regarding the relationship between religion and science – they hold that religious teachings about creation and scientific theories of evolution .
Free Evolution papers, essays, and research papers. Primates and Evolution - What makes a primate a primate.
A primate is defined by its many incredible features.
Essay on Evolution There are many mechanisms that lead to evolutionary change. One of the most important mechanism in evolution is natural selection which is the differential success in the reproduction of different phenotypes resulting from the interaction of organisms with their environment.
Thesis Charles Darwin's Theory of Evolution is the best evolutionary theory in history. This is true because Darwin was the one who came up with the basics of evolution such as natural selection and had proven those basics to be true.