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

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

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

The associative law is one of the basic laws of mathematics.

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

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

The epiblast plays a crucial role in early mammalian embryogenesis.