The epiglottis is a flap in the back of your tongue that prevents food from entering the larynx. When your mouth is closed, the epiglottis is in place and blocks the larynx opening. If your mouth is open, the flap lifts and the larynx is no longer blocked so you can breathe. This is why it's important to not chew with your mouth open... if you do, then food can go down the larynx by mistake.
A scientific experiment, in the form of the scientific model, is a testable model used to seek explanation for natural phenomena.
D. Cannot repopulate the world with endangered organism
Answer: Enzymes <u>b. increase</u> the rate of a specific chemical reaction.
B) cell because all living things are made up of cells
