Different parts of living things work together during respiration. Oxygen enters the nose and follows the path to your lungs. Cilia help keep the oxygen that moves into your lungs clean. Next alveoli allow oxygen from the air to pass into your blood. All of these parts working together create a very important process for humans. What is this process called?

A) digestion
B) evolution
C) reproduction
D) respiration

What should you do if you have an anxiety attack when your parents aren't home?

Acne is caused by a. a strict diet b. eating at night c. hormones d. dry skin select the best answer from the choices provided. a b c d

Which statement best illustrates that problem solving can create new medical devices? robert hooke was in charge of verifying the information that was sent to the royal academy. william harvey did experiments with apes to learn about the circulatory system. the stethoscope was invented because the physician did not want to put his head on women's chests to listen to their heart and lungs. anton van leeuwenhoek was a very curious man and looked at just about everything under this microscope.