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a collection of tissues joined in a structural unit to serve a common function.
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
microscopes that do not rely on light to produce images. They are used to study the internal...
a type of nuclear division during which reproductive cells divide to produce gametes. The...
the space in the middle of the tooth which contains cells, blood vessels and a nerve.
neurons that transmit nerve impulses away from the central nervous system to the effectors.