Normal cells<span> listen to signals from neighboring </span>cells<span> and stop growing when they encroach on nearby tissues (something called contact inhibition.) </span>Cancer cells<span> ignore these </span>cells<span> and invade nearby tissues. Benign (non-</span>cancerous<span>) tumors have a fibrous capsule.</span>
Troposphere because it is at the very top. As u delve deeper, you get to the core which is the hottest part of the earth
It is 4 because you need to add the 0's
