activate: (in biology) To turn on, as with a gene or chemical reaction.
angle: The space (usually measured in degrees) between two intersecting lines or surfaces at or close to the point where they meet.
auditory nerve: The nerve that carries electrical signals that represent sound from the ear to the brain.
bladder: A flexible bag-like structure for holding liquids. (in biology) The organ that collects urine until it will be excreted.
cell: (in biology) The smallest structural and functional unit of an organism. Typically too small to see with the unaided eye, it consists of a watery fluid surrounded by a membrane or wall. Depending on their size, animals are made of anywhere from thousands to trillions of cells.
chemical: A substance formed from two or more atoms that unite (bond) in a fixed proportion and structure. For example, water is a chemical made when two hydrogen atoms bond to one oxygen atom. Its chemical formula is H2O.
cochlea: A fluid-filled hollow tube in the inner ear of humans and many vertebrates that has a spiral shape. That shape lets different sound frequencies (wavelengths) stimulate particular regions of the spiral. This creates a sort of map for incoming sounds and enables animals recognize different pitches of sound.
cones: (in biology) A type of eye cell that is part of the retina inside the back of the eye. These cells can sense red, green or blue light. Recent research has uncovered evidence that many can sense white light — but only white light.
data: Facts and/or statistics collected together for analysis but not necessarily organized in a way that gives them meaning. For digital information (the type stored by computers), those data typically are numbers stored in a binary code, portrayed as strings of zeros and ones.
develop: To emerge or to make come into being, either naturally or through human intervention, such as by manufacturing. (in biology) To grow as an organism from conception through adulthood, often undergoing…
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