User: Many animals have body symmetry with distinct front and back ends. This type of symmetry is A. unilateral symmetry.
Cumulonimbus, from the Latin cumulus (heap) and nimbus (rainstorm, storm cloud), is a dense towering vertical cloud associated with thunderstorms and atmospheric instability, forming from water vapor carried by powerful upward air currents.
cumulonimbus - a dark cloud of great vertical extent charged with electricity; associated with thunderstorms. cumulonimbus cloud, thundercloud. cloud - a visible mass of water or ice particles suspended at a considerable altitude.