The Tundra is located in the Northern Hemisphere. The Tundra can get really cold the average temperature is -28 C. Only certain types of animals like the snowy owl, wolves, or caribou can survive in these extreme temperatures. This is because they all have special adaptations that allow them to survive in freezing temperatures. For example the snowy owl has dense feathers that keep it warm. Therefore these adaptations make living possible in the Tundra.
Forest can be found anywhere in the world. Typically a the average temperature for a forest would be between 70-100 degrees. Also a forest usually gets around 15-20 in of rain each year. Due to the extremely cold winters only certain types of trees can survive in forests. The main reason that firs, spruces, and pines thrive in the Boreal forest is their ability to adapt to this type of environment. For example the dark needles on spruces and firs allow them to adsorb the heat from the sun and begin photosynthesis earlier than other plants. As a result these are adaptations that organisms need to survive in forests.
The grassland location varies because there are many around the world. The average temperature in the summer is 38 degrees and in the winter -48 degrees. Rainfall each year is about 20-35 inches.