Darwin proposed that individuals with hearty traits argon to a greater extent likely to survive and reproduce. Darwin called this process natural selection. Darwin did not understand how or why variation existed. nowadays scientists realize that variation arises through random changes (called mutations) to existing genes. Genes are the chemicals that determine the traits and characteristics of animals and plants. Every trait has one or more g...If you want to get a full essay, order it on our website: Ordercustompaper.com
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