When would a model be most beneficial to a scientist? A. when a scientist wants to do a hands-on experiment

B. when a scientist wants to represent things that are either very large or very small

C. when a scientist wants to be creative

D. when a scientist doesn't want to confuse other scientists

What's the waste product of electrons and pyruvate combining in fermentation?  

Which of the following types of stars is most likely to end up as a supernova? in graph a, the curve peaks at 800 nm, in the red section of the visible light spectrum. in graph b, the curve peaks at 550 nm, in the green section of the visible light spectrum. in graph c, the curve peaks at 450 nm, in the blue section of the visible light spectrum. in graph d, the curve peaks at 300 nm, in the violet section of the visible light spectrum. a b c d

In which part of the body is a ball-and-socket joint found?