Please help.

D - Velocity is speed with direction.

Explanation:

The difference between speed and velocity is simple:

Speed can be represented as the change in distance over time, while velocity is just speed with direction.  

For example, the speed of an object that traveled 10 meters over 5 seconds traveled at 2m/s.

But, if that object was traveling, say, North, then the velocity of the object would be 2m/s North.

On a side note, any change in the velocity is just acceleration, whether it is changing direction or slowing down.

Hope that was of help :)

colorectal cancer may also develop from areas of abnormal cells in the lining of the colon or rectum. this area of abnormal cells is called dysplasia and is more commonly seen in people with certain inflammatory diseases of the bowel such as crohn's disease or ulcerative colitis.