<span>I believe it was 300 BC.</span>
Cancer cells can form in practically any area of the body, but the main feature that unites all cancer cells is that they divide and replicate without end, until large tumors form.
Answer: mountain roads are winding and gently sloping in order to reduce the effect of steepness which causes more downward gravitational pull to the vehicle on it . A steeper sloped road would slow the car down to a greater extent that an gently sloping one.
Explanation:
Answer:
Ozone high in the atmosphere is a pollutant, but near Earth's surface, it provides protection from harmful rays.
Explanation:
I had this test last week so here you go, let me know if it helped!