The microscope
Cell theory is not directly dependent on Antonie van Leeuwenhoek's invention of the microscope, although his microscope did improve the observation of cells. The cell theory was established based on the work of multiple scientists, including Robert Hooke, Matthias Schleiden, and Theodor Schwann. It states that all living organisms are composed of cells, cells are the basic units of life, and cells arise from pre-existing cells.
The theory would have been possible, the proof would have been somewhat harder to get.
no.
Well, that's not possible. It is called a theory because it can't be definitively proved. For instance, we know gravity exists, so it is a scientific law, but there is no definite proof for evolution, so it is just a theory.
The astronomical telescope.
No. Ptolemy had no knowledge of Saturn's rings; prior to the invention of the telescope, the rings of Saturn were unknown.
The theory would have been possible, the proof would have been somewhat harder to get.
None. Theoretical physicists work on questions like the beginning of the universe, the possible end of the universe, and the Big Bang Theory.
the theory of evolution
The microscope
general theory of relativity!
The Quantum Theory.
because cells are too small to see with the naked eye. if you get a microscope, you can see them. seeing=believing. so, theory proved.
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In 1905, he published a paper on theory of relativity which can be considered as his first invention.
He invented the theory of quantam electrodynamics
Theory of relativity
Robert Hooke was the first to coin the cell theory. It was coined shortly after the invention of the microscope.