1. Innate immunity is found in?
2. Which contains bile salts that can kill bacteria? eyes, mouth, small intestine, stomach
3. The most abundant gas in Earth's atmosphere is?
4. Which group of animals with the most efficient respiratory system is the?
5. What are sphincters?
6. Which is not a secretion of the stomach?
7. Mammals lose solutes through?
8. Pheromones are advantageous because?
9. Instinctive behavior is?