Natural Selection: Survival of the fittest
Natural Selection is the survival of the fittest, those who are best adapted to their environment survive. In order for natural selection to happen you must have variation, differential reproduction and heredity. Natural selection happens when there is a variation in one species of organism. One variation of the trait gives an advantage to one of the organism's, allowing it to thrive in its environment. Since the environment doesn't support unlimited growth, the organism with the less-superior trait dies off. The superior organism then has babies, which inherit the superior trait from the parents (heredity). These babies continue to thrive and eventually the organism with the less-superior trait dies off. (1) This is the process of Natural Selection.
Speciation is the evolutionary process by which new biological species arise. There are four different types of speciation, Sympatric, Peripatric, Parapatric and Allopatric. Most of these are carried out by Genetic drift and involve one species getting put or separated into two environments and they eventually evolve differently in there two environments. Sympatric is different then the other three though, it does not involve separation. Sympatric is when infertile plants self pollinate a process called polyploidy.
Speciation is the evolutionary process by which new biological species arise. There are four different types of speciation, Sympatric, Peripatric, Parapatric and Allopatric. Most of these are carried out by Genetic drift and involve one species getting put or separated into two environments and they eventually evolve differently in there two environments. Sympatric is different then the other three though, it does not involve separation. Sympatric is when infertile plants self pollinate a process called polyploidy.
Evidence of evolution
Sources
(1) http://evolution.berkeley.edu/evolibrary/article/evo_25
And all the stuff on evolution is directly from my notes from class
And all the stuff on evolution is directly from my notes from class