PLEASE HELP!! For each pair of terms, explain how the meanings of the terms differ.
1 front and air mass
2 high-pressure system and low-pressure system
3 jet streams and global wind belts

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 are current extinctions of concern to enviromentalists?

Why is carbon the backbone of liveing things