Darwin's theory states that
Characters are acquired through inheritance
Nature selects species which can adapt
Affect of environment on evolution
Species change morphologically with nature
The species with the best adaptations to its environment will be the one that will be able to survive and reproduce which is stated by Charles Darwin.
Assertion: Lamarck's theory of organic evolution states that use and disuse of organs and changes in environment cause inheritable variations.
Reason: The principle of inheritance of acquired characters.