There are approximately 480 million alveoli present in human lungs. About 70% of the area of each alveolus is wrapped in capillaries.
These factors make the alveoli a perfect location for

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline.which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

What is the function of the somatic nervous system? connects the brain and the spinal cord to the rest of the body carry signals to the muscles and glands includes all nerves controlling the muscular system and external sensory receptors controls internal organs like the heart and bladder

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion