What are the different parts that make up a cell?

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Which of these describes how heat is transferred by convection* a. sunlight travels through space without the aid of fluids or solids. b. warm air rises and takes the heat with it, eventually, it cools and sinks c. air at the equator rises and sinks at the poles. d. air molecules touch the warm ground, heating them up *not conduction

Of the following elements, which is the least reactive? a. c b. h c. li d. he