Use Figures 34.5C and 34.18 to predict how global warming (rapid increase in Earth's average temperature; see Module 7.14) might affect the water cycle.

Explain why it is more energy efficient (in terms of the amount of total NPP required) to eat a pound of tofu (bean curd) than a pound of hamburger.

For which chemicals are biogeochemical cycles global? Explain.

Most of the nutrients available for plant growth in an ecosystem are .a. deposited in rain;b. made available through the recycling of decomposers;c. maintained within that ecosystem over time;d. B and C are correct;e. A, B, and C are correct

What roles do bacteria play in the nitrogen cycle?

Aquatic biomes differ in levels of light, nutrients, oxygen, and water movement. These abiotic factors influence the productivity and diversity of freshwater ecosystems. a. Productivity, roughly defined as photosynthetic output, is high in estuaries, coral reefs, and shallow ponds. Describe the abiotic factors that contribute to high productivity in these ecosystems. b. How does extra input of nitrogen and phosphorus (for instance, by fertilizer runoff) affect the productivity of lakes and ponds? Is this nutrient input beneficial for the ecosystem? Explain.

Which of the following is an ecosystem?

The biggest difference between the flow of energy and the flow of chemical nutrients in an ecosystem is that __________.

In an ecosystem, what will eventually happen to all incoming energy?