1. As water cools below 4°C, it expands and becomes less dense. Why is this beneficial to many organisms?
2. How can the viscosity of water both hinder and facilitate movement in aquatic animals?
3. Describe the changes in mineral content of water as it moves from rainwater to lake water and, eventually, to ocean water.
4. Explain the difference between a sample standard deviation and the standard error of the mean.
5. Both saltwater and freshwater fish have adaptations to control the movement of water and salts across their external surfaces. Describe what would happen without these adaptations.
6. Why does the boundary layer surrounding a photosynthetic organism make it more difficult to exchange CO2 and O2?
7. Why are deep ocean waters typically low in oxygen?
8. Explain the adaptation that allows thermophiles to live under very high temperatures.
9. Describe the adaptations that enable fish to survive in very cold seawater.
10. How do isozymes help organisms function in habitats with a wide range of temperatures?