Examlex
Jellyfish and worms have the beginnings of a nervous system.
Water Molecule
A chemical compound consisting of two hydrogen atoms bonded to one oxygen atom, essential for all known forms of life.
Hydrogen Atom
The simplest type of atom, consisting of one proton in the nucleus and one electron orbiting the nucleus, fundamental to the chemistry of life.
Polar Covalent Bond
A type of chemical bond where two atoms share a pair of electrons more or less unequally, creating a molecule with an electrical polarity due to uneven electron distribution.
Water Molecule
A compound formed by two hydrogen atoms and one oxygen atom, essential for life.
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