How do changes in the environment affect plants and animals?

Natural disasters are destructive forces of nature  which affect the environment. Some of these destructive forces are floods and droughts. 
A Flood is an overflowing of water onto 
land that is normally dry.                         
                                                                       A drought occurs when  a region
                                                                       suffers a deficiency of rain fall
                                                                      for an extended period of time.