Hello peeps of the world

Which of the following is the definition of ventilation as it relates to the respiratory system?

Which food preservation method can people use at home? a. fermentation b. irradiation c. pasteurization d. thermal processing

Take a nutritional supplement during times of stress a. is recommended by al doctors as a stress management technique b. has been scientifically proven to aid in stress management c. only adds to the stress you’re feeling d. can you feel better because you believe it will you