LIFE SCIENCE

Detailed explanation-1: -The theory of use and disuse was proposed by Lamarck. He suggested that changes in traits or characters occur in organisms depending on whether an organ is used or disused continuously.

Detailed explanation-2: -Darwinism became accepted as it has more evidence in its support than Lamarck’s theory, which suggests that organisms become more complex and do not exist as simple cell organisms over time. The emergence of genetic study also supports Darwin’s work many years after his death.

Detailed explanation-3: -According to Lamarck, new needs (besoins) arise in animals as a result of a change in the environment. This leads to new types of behaviour involving new uses of pre-existing organs. Their use leads to an increase in size or to other methods of functioning. Conversely, the disuse of other parts leads to their decline.