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A solid is often packed really close to each other and has a definate shape and definate volume while liquid doesn't have a definite shape and volume and takes the shape of it's container, liquid is often far apart from each other and can move freely. Np m8
C. Somalia
Sorry if it’s wrong
Well, I'd say it was Skinner because the rest didn't even research operant conditioning, they were only interested in classical one (which involved just association between 2 stimuli).