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.
Cirrus clouds are a high-level cloud (above 20,000 ft.), and they are made of icy crystals. These wispy, delicate-looking clouds arrive in advance of frontal systems, so they indicate the weather is about to change.