Which is an example of a pure substance? a. air b. salad c. hydrogen d. sugar water

Hydrogen. Because air is not pure because of pollution, salad is a solid substance so therefore cannot be pure and sugar water isn't pure because the sugar affects the waters state of purity. So, that leaves hydrogen

Interphaseinterphase

I’m not exactly sure what your trying to ask, but if it’s how an organelle is similar to a body system or a part a nucleus is like a in function. but i don’t fully understand what you’re trying to ask