General Biology

2. It contracts and flattens to create a partial vacuum in the lungs during inhalation.
5. The outer layer of cells of all aboveground organs that are in the primary stage of growth.
10. Is pulled from the air to produce food for plant growth.
11. It is the lungs large air spaces of birds.
12. Gases do not pass through the leaf cuticle; they pass through pores called __________.

1. Reptiles have this because this provides increased surface space for gas exchange.
3. Oxygen and carbon dioxide diffuses across __________.
4. This transports carbon dioxide back to the blood and loosely binds to oxygen and brings it across the bloodstream of the animal.
6. It is a Mammalian lung that is classified into millions of microscopic air sacs.
7. It is breathed in by the animals. Animal and plants needed this.
8. The opening and closure of stomata are due to physiological changes in the surrounding __________.
9. Tissue flaps which are richly supplied by blood vessels.