small cavity-shaped cell organelle performing functions such as storage, ingestion, digestion, excretion, and the like visible light

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to grow or enlarge by gradual buildup acid

living in the presence of oxygen algae

organic compound constituents of proteins, composed of carbon, hydrogen, oxygen, and nitrogen and sometimes sulfur amphibian

living in the absence oxygen anastomose

multicellular eukaryote organism that develops from an embryonic blastula anti-particle

a mechanism that allows cells to self-destruct when stimulated by the appropriate trigger; "programmed cell death" archaea

the first three billion years plus of life's history up to the Paleozoic arthropod

adenosine triphosphate, the metabolic "energy currency" of all cells asteroid