Which best describes derived characteristics?
they are newly evolved traits.
they appear in all the ancestors.
they appear at the end of each branch.
they stem from primary characteristics.

The best way to describe derived characteristics is that they are newly evolved traits. Derived characteristics belong to a group called a clade. The clade does not share traits with ancestors. They are evolved as a result of evolution. A clade is a group of organisms that share numerous similarities. The correct answer is A.

A. They are newly evolved traits. 

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.