In science, what is a model? a) a representation of something in nature b) a way to carry out an experiment c) all the controls within an experiment d) a picture of nature

Note: the following questions are unrelated to the balmer series or the martian. refer to your course notes. a sun-sized star will spend most of its lifetime as a: white dwarf b. red giant c. protostar d. main-sequence star

Organelles are 1. responsible for producing power for the cell 2. tiny structures in the cell that carry out the cell's activities 3. responsible for digestion in the cell 4. found outside of the membrane

What are the dimensions of the cross section that passes through the points a, f, g, and d?