Thursday, December 18, 2008

The Human Impact

For centuries, humans have had an impact on animal and plant habitats. For example, some animals had to adapt to new environments created by human settlement and industry. Also, by selective breeding, scientists have altered the genetic make-up of some plants and animals to create superior crops and meat for human consumption. Fruits, such as grapes and oranges have been bred so that they no longer have seeds and are therefore easy to digest.

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