The ability to use different types of energy has changed with technology over time. There are many ways to conserve energy. Peoples' use of energy affects the environment. People of different races, cultures and genders have contributed to developments in energy technology. Addison-Wesley focuses on trees in this unit.
Trees are plants.
Plant needs include sunlight, water, soil and air. Plants grow through life stages and reproduce to survive. Plants are producers because they turn sun energy into food energy. Dead plants decompose, and provide nutrients for other plants. Plants have similarities and differences and can be grouped by their characteristics.