Natural Selection

Natural Selection
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  •  Natural selection is involved in the theory of evolution which is the explanation by Charles Darwin of how species have changed over time by natural selection from a common ancestor. It leads to changes over long periods of time in species because of the organisms that are best adapted for the changing environment to survive and reproduce. Overtime, some traits of organisms become more common to the environment while other traits aren't very useful. The traits that become more common are the ones that make an organism more likely to survive. 
  • So an example of that would be how giraffes have long necks. The giraffe's long neck is an adaptation to the animal's environment. The giraffe evolved this trait in order to reach the leaves in high trees. That's how it works right?
  • Evolution and Natural  Selection
  • Yes, and speciation also comes from adaptation. With speciation, over time, different populations will not be able to reproduce with each other because population will evolve until distinct.
  • Would the cause of that be how differences between species like their different mating seasons, prevent species from breeding successfully with each other?
  • So does natural selection have something to do with how offspring are different from each other?
  • Correct, that is called reproductive isolation. Also, in speciation, formation of new species come from a common ancestor. A common ancestor can be found from the species of humans and files if you go back far enough.
  • Mrs. Smith is explaining natural selection and adaptation with her class.
  • Speciation is explained and how adaptation is related to it.
  • Reproductive isolation and the common ancestor is talked about.
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