Answer:
A repeated-measures design
Explanation:
This is a research design that is used to measure the same variables repeatedly on the same sample or subject over a given time frame or over different time periods and/or under various conditions.
Answer: a hallucinogen.
Explanation: i just did this for my health class .
During inhalation, the lungs expand with air and oxygen diffuses across the lung's surface all of this will enter the blood stream and exhaling isbreathing it all back out
