What are two things required for something to be matter?

This drawing shows a human body system. what is the primary function of this body system?

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.