Observe: Increase the Sim. speed by two levels. Click Play, and wait for a while. What occurs as time goes by?

Wind energy is plentiful in regions with vast open spaces it is a non polluting renewable resource what could be an economic factor that makes the use of this resource less feasible then non renewable resource even in such regions

Which flexible structure that supports the nerve cord and led to the backbone

What causes darkening of the skin as melanin production increases