What is something the plant cells and onion root have in common?

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

What is the independent variable in this investigation? mass volume sample number substance density

Voltaic cells produce a positive overall charge. what does this indicate? a. the reaction is likely to be endothermic. b. the reaction is spontaneous. c. the reaction is not likely to occur. d. the reaction is not spontaneous.