It is better to conquer yourself than to win a thousand battles. Then the victory is yours. It cannot be taken from you, not by angels or by demons, heaven or hell. Sea of Stars caused by microscopic organisms called bioluminescent phytoplankton - Vaadhoo Island in the Maldives.
Cnidaria - coral and jellyfish - radial symmetry - aquatic habitat - no coelom - incomplete digestive system - no circulatory system (diffusion) - simple nervous system - simple muscular system - complex reproductive system - hydrostatic skeleton - simple respiratory system - special stinging cells (nematocysts)