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single-celled brown algae found in fresh water and seawater. They have hard, shell-like cell walls that contain silica.
(also called radioactive dating) a method of measuring the age of fossils based on how much...
the process in plant cells where the cell membrane pulls away from the cell wall due to the loss...
structure that contains the two centrioles arranged at right angles to each other in animal...
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...