Carbon dioxide is returned to the atmosphere mainly by... 1. Consumption by animals
2. Elimination of waste by animals 3.Photosynthesis by producers
4. Combustion and cellular respiration

Explain two reasons you think it is important for scientists to search for new ways to treat cancer

Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses

Why is it incorrect to say that mitochondria function only as energy factories with cell