How do variations in a species develop?

Asked Dec 02, 2009
adaptations to new environments gives variation. survival of the fittest determines the general traits that each species variant has.. they work together. It boils down to genetics and inferior genes would be bred out as the necessary genes are bred in.

survival of the fittest would be like giraffes. they started with smaller necks but as food on the bottom disappeared, the animals with larger necks were able to survive and so the survivors mated with other survivors and off spring had long necks too.. but of course this kind of evolution takes generations to do.

where as variations like birds come about as where they live they (over time) developed the know how to survive (one species of bird actually grabs a bug or whatever its eating and sticks it to a pricker on a tree for it to eat, another species learned to drop a rock on top of large eggs, etc) and the birds that didn't have the right type of beaks or feathers for their environment wouldn't be able to survive in their environment so the birds that could survive would mate and off spring would have higher chances of survival.

Its not only in animal animals. Its in humans too. Like Africans (before people started living all over the world in countries they aren't native to) have dark skin to accommodate and protect them from the harsh sun. If we took a white person and made them live in the africa that the first slaves were brought over from, the white person would most likely die. their skin would not be able to handle it as well, not to mention the climate differences and cultural knowledge. A White person wouldn't know how to live off the land there like the natives would.

Hence why when the colonists came over they nearly died off because they didn't know how to live off the land. It's thanks to the native americans that the colonists survive (why we celebrate thanksgiving).

so the answer to your question is genetics. genes get bred out depending on the environment the group is in.
Answered Dec 31, 2009

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