Question

What was the first theory of evolution?

Answer 1

Evolution is defined as a change in a species' physical features over many generations as a result of natural selection. The theory of evolution is founded on the concept that all species are interconnected and evolve throughout time. Evolution is based on genetic diversity in a population, which influences an organism's physical features. Individuals with certain physical features may have an advantage that can be passed on to their kids.

Complete answer:
Jean-Baptiste de Monet Lamarck proposed Lamarckism in the years $1744 - 1829$. This hypothesis was founded on the idea that all physical changes that occur in an individual during their lifespan are passed on to their children. Consider the growth of an organ after it has been utilised several times. Lamarckism is the idea that an organism may pass on physical traits acquired by the parent organism via use or disuse throughout its lifetime to its offspring. It's also known as "acquired traits inheritance."
The organs that are used frequently by the organism expand in successive generations, whereas those that are used less are removed. When a giraffe bends its neck to eat leaves, for example, a "nervous fluid" flows into its neck, causing it to expand. With time, the organs that the organisms have ceased using would diminish.
From basic beginnings, creatures grew increasingly sophisticated as they adapted to their environments. Lamarck was a firm believer in life's spontaneous generation.
Throughout one's life, he or she develops specific qualities. These characteristics are passed on to their children. He used the example of a blacksmith to illustrate his point. The nature of a blacksmith's profession necessitates strong arms. He suggested that any offspring conceived by a blacksmith will inherit the ability to grow powerful muscles.
All creatures are influenced by their surroundings. Changes in the organisms are triggered by even minor changes in the environment. This creates new requirements, which in turn creates new structures and modifies organisms' behaviours.

Additional information:
Charles Robert Darwin was an English scientist, geologist, and biologist who is well known for his theory of evolution and natural selection process. He proposed the idea of evolution known as "Darwin's theory of natural selection" and wrote a book titled "Origin of Species by Natural Selection."

Note:
Evolution is the gradual change of hereditary characteristics over a long period of time, generally generations. Temperature, climate, resource availability, and other environmental variables all had a significant influence in evolution. When an organism needs to fill a niche but is unable to do so with its current body design or structural components, evolution takes place. As a result, we may conclude that evolution occurred because the environment demanded change in order for the species to survive and thrive, rather than because the previous form was faulty.