Dead space is the portion of the respiratory system that: select one: a.. must be filled with air before gas exchange can take place. b. contains no alveoli and does not participate in gas exchange. c. includes the alveoli and capillaries surrounding the alveoli. d. receives oxygen but is unable to release carbon dioxide.

Plz mark brainliest 30 points1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s.2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

What is the molar mass of a gas that has density of 2.054 g/l

The identities of substances are the same before and after which type of change