In this experiment, you need to examine the idea of thermal energy transfer. using a controlled experiment, what might a good question about the variables that affect thermal energy transfer be? thermal energy transfer depends on many properties, but limit your question to only two.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.