Help please !

In sexual reproduction, why is fertilization necessary to produce an organism ?

1. Fertilization allows an organism to receive a complete set of chromosomes -one set each parent .

2. Fertilization is needed to make the cell bigger . A bigger cell leads to the development of an organism .

3. Fertilization allows an organism to reproduce asexually , making identical clones of itself.

4. Fertilization is needed so that the egg cell can obtain nutrients from the sperm cell. Without these nutrients , an organism cannot develop .