Which statement best describes a scientific question? It must be based on a hypothesis.
It must be supported by data.
It must be testable.
It must be original

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Which of these serves as a reference for comparison during a scientific investigation? a)outcome variable (dependent variable) b) test variable (independent variable) c)control group d)hypothesis

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z