I believe it's producers, correct me if I'm wrong.
<span>The fertilization of a female egg cell with a male sperm cell is also referred to as Conception (option D)
This process is also known as generative fertilization, conception, syngamy and impregnation. It is the union of gametes to begin the development of a new individual or organism.
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Cells are combined in a structure called tissue wich have the same properties like the cells wich are formed by.
Im not really sure , but it might have something to do with polar chemical compound <span />