What similarities are there between corona virus and typhoid fever? What are the differences?

What are the four basic classes of organic molecules how do they differ structurally and functionally

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

About __ of the mass of the cell is water