Avein in a leaf has what important function?

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

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?