Lamarck's theory included inheritance of acquired characteristics, meaning that an organism's lifestyle could bring about changes that it passed on to its offspring. ... Darwin observed that wild animals and plants showed variations just as domesticated animals and plants did. He filled his notebooks with records of height, weight, color, claw size, tail length, and other characteristics among members of the same species. ... Plant stems grow tall in search of sunlight, plant roots grow deep into the soil in search of water and nutrients. ...

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• Approx Pages: 11
• Grade Level: High School

Evolution is the natural process through which organism have acquired their characteristics, structure and function. The past few centuries have witnessed a thorough inventory of the million or more species of plants and animals living today, as well as the thousands of extinct species. ... How can the many similarities and differences among plants and animals be explained? ...

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• Grade Level: High School

He pointed out the existence of variations differences among members of the same species and suggested that the variations that prove helpful to a plant or an animal in its struggle for existence better enable it to survive and reproduce. ... As originally formulated, Darwinism did not distinguish between acquired characteristics, which are not transmissible by heredity, and genetic variations, which are inheritable. ...

• Word Count: 1110
• Approx Pages: 4
• Grade Level: High School

Sexual selection is natural selection arising through preference by one sex for certain characteristics in individuals of the other sex. ... Plants had evolved and providing food and other sources to organisms to survive. ...

• Word Count: 1403
• Approx Pages: 6
• Grade Level: High School