Examlex
The endoderm gives rise to the nervous system and the epidermis of the skin.
Element
A substance that cannot be changed to a simpler substance by a normal chemical reaction.
Neutrons
Subatomic particles without an electric charge, found in the nucleus of an atom, contributing to the atom's mass.
Electrons
subatomic particles with a negative charge, found in all atoms and acting as the primary carrier of electricity in solids.
Valence Shells
The outermost electron shell of an atom that determines its bonding behavior with other atoms.
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