Original DNA →TACAGGGTCCACACT Mutated DNA →TACAGGCGTCCACACT
What type of mutation took place in the above situation

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

Can someone i have no idea of how to do this.

Explain how scientists use geologic time to determine the age of landforms.