Ais an internal sac-like respiratory surface that allows oxygen to be absorbed from the air.
a. lung
b. trachea
c. gill
d. pharynx

Fill in the table below by placing check marks in the appropriate boxes and writing the product of transcription and translation. super

Which of the following is true about vigorous intensity movements. playing single tennis or riding a bike on a hilly surface playing soccer riding bike on a flat surface playing double tennis or playing basketball all of the above

Which of these is a fact about performance enhancing drugs? a. steroids lack addictive properties. b. steroids use can cause dangerous side effects. c. it is safe to use steroids when working out. d. a person can get in legal trouble for using steroids.