Activities

### Activity 1

Complete the word search on gaseous exchange below. Identify the term from the description and then find the term in the word search.

Description
1. Occurring in the presence of oxygen
2. Occurring in the absence of oxygen
3. (Plants and animals) living in water
4. (Plants and animals) living on land
5. The exchange of O2 and CO2 at a respiratory surface
6. Mechanical process of inhalation and exhalation through which air moves in and out of the respiratory organs, enabling the uptake of oxygen and the removal of carbon dioxide
7. An organelle found in large numbers in most cells, in which cellular respiration and energy production occur
8. The movement of molecules from a region of high concentration to a region of low concentration until equilibrium is reached
9. Many tiny air sacs of the lungs which allow for rapid gaseous exchange
10. Small branches in the lungs ending in air sacs
11. Fine tubes that make up part of the respiratory system of insects