This story not only based on present time and not only humans,this story based on all living things those are presence in nature like microorganism to Bully mamath and world largest animal we called it Blue Whale.Everyone going through struggle to their life time,when they existence in nature and earth.They wouldn't left this process because this process is joined our existence.If they think we are left from struggle stay away so this could not happen at point of view.Because having struggle like bone marrow in our body. Without bone marrow we can't think and geastures movement.Even everything need to struggle and struggle make a why we have born?And what is the reason behind our creation?Like that we have many questions in our mind.