A pet owner dropped some new fish into a pond. Several species of fish lived in the pond, but within a few months, only members of the new species survived. What BEST explains why this happened? A: Too many fish caused an imbalance in the ecosystem, so the food web was affected.

B: All new species have an advantage in an ecosystem.

C: The new species was probably bigger than the other fish in the pond.

D: All of the species were dying out, and the new species was the last to survive.

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.