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Leonardo's ability to observe and study, then demonstrate those things in his art, he was pretty much the definition of a Renaissance man. Defined: Renaissance man: a person with many talents or areas of knowledge.
The answer would be D. because only half the people would vote for one candidates
1 is b high birth rate and death rate 2 is a low birth rates death are constant and 3 is c high birth rate and low death rate
For his refusal to authorize large scale relief programs
Well when scientists wish to learn something, they use the scientific method. The first step is to observe something/could be a problem. Then ask a question about it. Form a hypothesis, or a possible answer to that question. These are the first steps.
Further steps include setting up an experiment and results, etc, but I think you know the rest! Hope this helps!