Answer: over time, scientists have extracted scientific hypotheses from their observations and experiments, or rules that describe how nature works.
Explanation: because the scientists don’t only use chemicals but they use there mind they always Connect them with the work they are doing and like but there body Force to touch, and smell.
The cell wall in the animal plant cells are absent from the cell and the and the plant cell walls are present.the shape of the animal cell is round which is an fixed shape and the plant cell is rectangle which is and irregular shape.And animal cells don't have chloroplasts and <span>Plant cells have chloroplasts because they make their own food.</span>
If a bacterium cannot use citrate agar will not change its color (stays green). On the other hand, if bacteria have the ability to use citrate, the medium will change its color from green to blue.
This happens because citrate agar contains pH indicator such as bromothymol blue which transforms from green to blue in alkaline conditions.
It is to always protect you eyes at all cost so you can not get blind