The instrument that was necessary for Cell Theory to be developed is the microscope.
what instrument was necessary for the development of the cell theory? you would need cells. you can't have the organism without cells. you can't have a school without people. so the answer is cells.
Microscopes.
Before the cell theory could be developed, the invention of the microscope in the 17th century was necessary. This allowed scientists like Robert Hooke and Anton van Leeuwenhoek to observe and describe various cellular structures. Additionally, advancements in staining techniques were needed to visualize cells more clearly.
Yes, by around 50 years. Natural selection was developed in the 1850s-60s. Relativity was developed in 1905.
Adam Smith developed the theory of classical capitalism.
Francis Galton developed the theory of Eugenics
john dalton developed the atomic theory , which he published in 1803
Albert Einstein developed the theory of relativity. He first proposed the special theory of relativity in 1905 and later developed the general theory of relativity in 1915. These theories revolutionized our understanding of space, time, and gravity.
The Geocentric Theory was developed by Greek astronomers. The theory was that celestial bodies moved around Earth in circular paths.
British scientist Charles Darwin (1809-1882) developed the theory of evolution (the theory that living organisms developed slowly over long periods of time).
the camera
The theory is called the Special Theory of Relativity.