What are the parts of Lamarck's theory of evolution?

Explanation

Option D is correct because it encompasses all major elements of Lamarck's theory: traits lost through disuse, acquired traits being inherited, and the development of traits based on need. Although influential historically, Lamarck's ideas have been largely refuted in modern science, which favours Darwin's theory of evolution through natural selection. Current understanding shows that acquired traits are not heritable, with evolution driven by genetic variation and selective pressures rather than by use and disuse or environmental needs. Options A, B, and C are incorrect individually because each represents only a part of the overall theory, not the comprehensive view.