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What is the process through which a new cell is formed by the joining of male and female reproductive cells?

  1. Excretion

  2. Fallout

  3. Fertilization

  4. Fission

The correct answer is: Fertilization

Fertilization is the process through which a new cell is formed by the joining of male and female reproductive cells. This process is essential for the continuation of life in most living organisms. Option A, excretion, is the process of removing waste products from the body, which has no relation to the formation of new cells. Option B, fallout, typically refers to the descent or dropping of something, and has no relation to cell formation. Option D, fission, is the splitting of one cell into two identical cells, which is a form of asexual reproduction and not related to the joining of male and female reproductive cells in fertilization. Thus, the only correct option is C, fertilization.