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single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell walls that contain silica.
a special kind of biological identification key which consists of sets of organised pairs of...
a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
animals that live socially or in colonies and perform certain tasks for the good of the colony...
a state in which the body temperature has dropped to dangerously low levels.