Science 2a Unit 7 Answer Hot! — Aristo

: Involves the nasal cavity, trachea, bronchi, bronchioles, and air sacs (alveoli). Gas exchange occurs at the air sacs where oxygen enters the blood and carbon dioxide leaves it.

In a small village surrounded by a lush forest, a group of scientists from the Aristo Research Institute had been conducting a study on the local butterfly population. The villagers had noticed a significant decrease in the number of butterflies in the area over the past few years, and the scientists were determined to find out the cause. aristo science 2a unit 7 answer