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very small organisms that are invisible to the naked eye.
is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...
a microscopic hair-like extension of the cell membrane of the epithelial cells forming the outer...
the outermost layer of the plant cell wall that forms the contact surface between adjacent plant...
simple chemical substances needed by the body in relatively small amounts for normal growth and...
organelles in which cellular respiration takes place to produce ATP to supply cells with energy...
a type of nuclear division during which somatic cells divide into new cells for growth or to...
the teeth found at the back of the mammalian jaw. In herbivores they have broad surfaces and...
a substance that consists of two or more chemically joined atoms.