Robert Hooke an Englishman was the first scientist to observe cells
The scientist should use an electron microscope
Anton The_first_scientist_to_observe_living_cellsLeeuwenhoek
Experiment- "In a experiment, the scientist deliberately makes certain changes in the world about him so that he can observe the consequences."
Microscope. A scientist might use a microscope. Well actually, it depends on the size of the animal. If it is microscopic, then scientists might have to observe it using it using a microscope. If it can actually be seen, then scientists mught actually take a sample of it back to the labratory to observe physically.
the lithosphere (aka the crust)
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Bacteria
A scientist studying how populations evolve would most likely observe organisms with short generation times, high reproductive rates, and large population sizes, such as bacteria or fruit flies. These organisms allow researchers to observe multiple generations quickly and see how genetic changes occur over time within a population.
By using a telliscope
Robert Hooke an Englishman was the first scientist to observe cells
The scientist should use an electron microscope
they watch clouds.
They Observe, Predict and Infer
Gallo
The scientist should use an electron microscope
It allows a scientist to measure the wavelength of light.