Fertilization (also known as conception, fecundation and syngamy) is the fusion of gametes to initiate the development of a new sexual individual organism. Answer: Sexual reproduction
The weathering of rocks by a physical means is known as mechanical weathering. chemical weathering. erosion. molecular weathering.
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I'm sorry @Liannaj , but sexual reproduction is the reason for fertilisation. Fertilisation is the fusion of both male and female gametes and it takes place in the female body ( it can also take place outside the body) as explained by @emiliovega . Asexual reproduction does not involve fertilisation.