Metallic bonds are formed by ions floating in a sea of electrons.

The blastula stage is an early stage where the fertilized egg divides and becomes a cell with many cells.

Germ cells play an important role in the reproduction of organisms.

The process of embryogenesis is very complex, with continuous cell division and differentiation.

A metallic bond refers to a strong bond between metal atoms.

The blastoderm is formed in the early stages of embryonic development.

The epiblast plays a crucial role in early mammalian embryogenesis.