Why are there few, if any trees in a grassland biome

What effect does plate tectonics have an organic evolution

Could someone me with number one you

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?