RE: LeoThread 2025-08-01 19:49

Part 2/8:

When a sperm fertilizes an ovum, they fuse to form a zygote, which then develops into an embryo via mitosis—a type of cell division that produces genetically identical daughter cells. The zygote initially forms a hollow sphere called a blastula (or blastosphere). In early embryonic development, particularly in simpler animals like sponges, this blastula develops into a blastula larva, which swims to a suitable location, attaches to a surface, and matures into a new organism.

Embryonic Development: From Blastula to Gastrula