Theme Review

In Theme 6, you learned:

• what energy is and where it comes from
• how energy flows through the biosphere
• how energy is transferred from organism to organism by way of food chains
• why less energy is available as you move up the energy pyramid
• about ecosystems
• how climate affects ecosystems
• about biomes
• how humans affect the diversity in systems
• what a population is
• about the factors that determine the size of a population
• how interactions among organisms limit populations
• about the impacts of food and energy production on the environment
• about waste managements practices
• about environmental laws