test how you can give best information in the least time
afterall time is money
value it & be fast, short &simple
2007-07-24 18:42:48 · 14 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Evolution is a change in the genetic composition of a population during successive generations, as a result of natural selection acting on the genetic variation among individuals, and resulting in the development of new species.
2007-07-24 22:45:31 · answer #1 · answered by Anonymous · 1⤊ 0⤋
There are three simple observations about species:
1. Inheritance - Offspring inherit characteristics from parents.
2. Variation - Not all members of a species are identical.
3. Competition - Members of a species compete for resources and mates.
Those three things produce a basic mechanism for observed evolution:
4. Natural selection - Those individuals born with characteristics that give them some slight advantage, will tend (on average) to pass those very traits onto offspring in bigger numbers than those with less advantageous traits. This is how the average traits in a population change over time.
Key point: Random variation (mutations) filtered by *NON-RANDOM* natural selection.
2007-07-25 01:58:34 · answer #2 · answered by secretsauce 7 · 3⤊ 1⤋
Those organisms that are better able to live longer and produce more offspring give more of their traits to the next generation. Sometimes those traits get changed by mutations. The different mutations that build up from generation to generation, along with varying/changing environmental conditions, will cause the mutated members of the species to get to a point where they can't interbreed with the non-mutated members, and a new species is "born".
Obviously, that's a very simplistic version, and Darwin didn't know anything about genetic mutations, but he knew that there was some sort of change taking place from generation to generation.
2007-07-24 20:23:55 · answer #3 · answered by the_way_of_the_turtle 6 · 0⤊ 1⤋
basically, two organisms (of the same species) compete for food, escape from predators, etc. one is more able or "fit" to do this because of a genetic mutuation that developped wings (crud example) this organism with wings will be more likely to survive and reproduce than the other, and this in the long run creates new species
note: the wings are a crud example of a physical advantage, such as being faster or stronger or smarter
2007-07-26 06:05:22 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Nature favors traits which best insure the survival of the organism. These traits are then adopted by future generations which changes the species from it original form.
2007-07-24 18:53:15 · answer #5 · answered by The_Overlord 3 · 0⤊ 0⤋
An individual which has a mutation that allows it to better adapt to the environment it is in, will give rise to a species
that survives and supplants less adaptable species.
2007-07-24 18:53:27 · answer #6 · answered by October 7 · 1⤊ 0⤋
Biological evolution, simply put, is descent with modification. This definition encompasses small-scale evolution (changes in gene frequency in a population from one generation to the next) and large-scale evolution (the descent of different species from a common ancestor over many generations). Evolution helps us to understand the history of life.
Biological evolution is not simply a matter of change over time. Lots of things change over time: trees lose their leaves, mountain ranges rise and erode, but they aren't examples of biological evolution because they don't involve descent through genetic inheritance.
The central idea of biological evolution is that all life on Earth shares a common ancestor, just as you and your cousins share a common grandmother.
Through the process of descent with modification, the common ancestor of life on Earth gave rise to the fantastic diversity that we see documented in the fossil record and around us today. Evolution means that we're all distant cousins: humans and oak trees, hummingbirds and whales
Sorry... the preview of my answer had15 lines!
What can I say?
2007-07-24 18:56:58 · answer #7 · answered by boggle10 6 · 0⤊ 2⤋
It's basically based upon his theory that only the strongest, fittest, or in our cases smartest survive to pass on their genes. His theory of evolution is the basis that through random genetic mutation creatures who could adapt to their changing environment had the right to live and those who could not would die.
2007-07-24 18:52:17 · answer #8 · answered by Khelben 6 · 1⤊ 2⤋
Secretsauce has it correct. Give him the Best Answer.
2007-07-25 05:55:16 · answer #9 · answered by Anonymous · 0⤊ 0⤋
its a long theory, u read to some book and good description in cell biology book.
2007-07-24 22:28:10 · answer #10 · answered by rizwana s 1 · 0⤊ 1⤋