S P E C I E S
Life on Earth is full of different species. Each species is adapted to a different environment. All you have to do is look around and observe.
In a forest, species specialization can be seen in the layer system of forest life. Animals that live on the top of the trees dare not come to the ground. It is too dangerous for them. Besides, all food and shelter that they need to survive is on the top layer of the forest. The same can be said about animals in the middle layer and in the ground layer. Other species, like some types of bacteria, have to live inside the bodies of other animals to survive. If they go in the open for too long, they die.
Humans also use to have their place in nature. They used to live in caves and feed on plants and on game. However, unlike other species, humans reasoned and wanted to change nature. They started defending themselves from their natural predators. They wanted to have a more comfortable life.
If we are careful enough to observe nature, we will see that humans are the biggest threat living on earth today. They are used to doing only what they want, and not what they must. They are not used to doing what they ought to do in favor of life in this planet. Things have gotten so out of control that humans constitute the single species that acts against the rules of nature. They dare so much in favor of their own well-being that life of all species on earth is threatened, including human life.
(PRESCHER, E; PASQUALIN, E; AMOS, E. New Graded English. Editora Moderna. Adaptado.)
It is possible to observe in the text that human being is
