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.
Nimbostratus (Ns) Nimbostratus clouds are also found below 2000 meters. They are usually a darker color of gray than stratus clouds because of their high moisture content - precipitation usually occurs with this cloud type. The base of this cloud can be difficult to identify and it may stretch high into the atmosphere.