An egg cell is released from the ovary., A sperm fuses with the egg cell, this is called fertilisation., The fertilised egg cell travels towards the uterus through the oviduct., The fertilised cell begins to divide into a ball of cells, this is called an embryo., The embryo sticks to the uterus lining, this is called implantation..

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?