A scientist, or anyone using the "scientific method."
The noted Arabian mathematician and philosopher Ibn al-Haytham, aka Alhazen (965-1039 AD) was one of the pioneers of the experimental process in scientific methodology.
Gregor Mendel, and later Charles Darwin, extended the scientific method to genetics and Biology.
they both observed living thing's decided that any organism could be classified as either a plant or an animal. So they divided them them into groups depending on their differences and similarities and gave all living things a specific name
Antonie Van Leewenhoek first observed cells inside living animals with his microscope.
There is no certain answer to this question.
The observation that Darwin made for the species on Galapagos Island is that they adopt the feature according to the habitat they are living in. You can get more info on naturegalapagos.com
This question is vague therefore I have provided two answers and explanations. The single cell is the smallest living unit within a living system. Quarks are the smallest particles of matter and atoms which composes all living things.
One observation of early scientists that supports the cell theory is that all cells divide which was observed in 1855. The other observation was that living things contain cells which was observed in 1839 by Theodor Schwann.
Robert Hooke observed the first non-living cell.
Anton Von Leeuwenhoek observed the first living cell in around 1674,although Robert Hooke observed a dead cell in 1663.
An observation that is observed in large quantities.
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The cells that were first seen were nonliving.
Anton Von Leeuwenhoek observed the first living cell in around 1674,although Robert Hooke observed a dead cell in 1663.
observation are made in a living mouse
Anton Von Leeuwenhoek observed the first living cell in around 1674,although Robert Hooke observed a dead cell in 1663.
microscope
anton van leeuwenhoek
Nonliving