Answer :
gamete is the answer because,
a gamete is a a mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote.
a gamete is a a mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote.
All multicellular organisms need gametes for sexual reproduction to occur. Option D is correct.
Sexual Reproduction:
It is method of reproduction in which gametes of two different parents fertilize to for zygote.
- Gametes are the haploid cells such as sperm and egg.
- Fertilization is process by which gametes fuse together ton form a zygote.
Therefore, all multicellular organisms need gametes for sexual reproduction to occur.
To know more about gametes,
https://brainly.com/question/19860559