ONE IS MOVING FAST THAT'S BASICALLY IT THE ANIMALS AT THE LOWER PARTS OF THE FOOD CHAIN THEY REPRODUCE VERY FAST THEY GROW REALLY FAST THEY PRODUCE MILLIONS OF EGGS UP THERE YOU HAVE SHARKS AND LARGE FISH THAT LIVE 25 30 YEARS THEY REPRODUCE VERY SLOWLY THEY HAVE A SLOW METABOLISM AND BASICALLY THEY JUST