1 mile.
Since he walks at a speed of 2 miles per hour, he will have only walked 1 mile after walking for half of an hour.
B because a and c are incorrect and in letter d it states earth has no protection at all. And it DOES have protection B is most definitely true
Answer: B
Explanation: because it adapt to its environment to survive
Answer:
the natural process that warms the earth's surface is known as natural greenhouse.
I think it’s propanol, i’m not too sure
