Schleiden & Shwann
a theory which is made by observation
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cell theory
His theory was that all plant parts are made of cells.
the cell theory
The frozen plasticity theory is made by alan guth
A theory will have to be given up when some observation is made within the scope of the theory that contradicts the theory. A new logical theory which encompasses or accounts for all observations made till date within its scope will have to be formulated.
Particle theory, as opposed to string theory.
cell theory
The heliocentric theory was originated by Copernicus.
kinetic theory.
he made a theory of evolution that made sense.