Which of the following concept is attributed to Charles Darwin

Options :
  1. use and disuse of organs is of great importance in evolution
  2. every cell must come from a preexisting cell
  3. in the struggle for existence, the fittest would survive
  4. the gametes will carry only one of a pair of contrasting characters
Answer and Explanation :-

Answer: Option 3


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Pieces. A bit for someone here. A bit there. And sometimes they don't add up to anything whole. But you are so busy dancing. Delivering. You don't have time to notice. Or are afraid to notice. And then one day you have to look. And it's true. All of your pieces fill up other people's holes. But they don't fill your own.
-Mary E. Pearson The Adoration of Jenna Fox