Lamarck's law of use and disuse states that
Correct answer: A. an organ that is constantly used becomes better developed while a disused organ degenerates
- A. an organ that is constantly used becomes better developed while a disused organ degenerates
- B. all organs of the body remain unchanged throughout life
- C. organs change only when their genes mutate
- D. an organ once lost can never reappear in any descendant
Explanation
This is the first of Lamarck's two laws, and he used it to explain the strong limbs of a blacksmith, the webbed feet of water birds and the loss of eyes in cave dwellers. His second law, the inheritance of acquired characters, is what turns these lifetime changes into evolution. Modern biology accepts that use develops an organ but denies that the development reaches the offspring.
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About Lamarckism
Lamarckism explains evolution through environmental influence, use and disuse of organs, and the inheritance of acquired characteristics. It differs from Darwinian natural selection because Lamarck proposed that organisms develop useful traits during their lifetime and pass them on, a view not supported by modern genetics.
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