Jim walked along the sinuous path to school, conveying his book bag. The scent of the forest pervaded through the air, and Jim noticed that the trees were vibrant and full of color. Then he saw a raven and got an ominous feeling. However, the foreboding feeling faded when he began thinking about school. He loved his teachers and was grateful for the admonitions he received from them.
You might think that the pain of falling off your bike is excruciating, but it is nothing compared to the carnage of war. After you fall off your bike, someone can assuage your pains, but in war, mutilated soldiers are often left to die.
Wars start irrationally, and they end once one side relinquishes its army. We all hope that one day warfare will become obsolete.
You might be skeptical about how animals assimilate to new environments, but its simpler than you'd think. For example, an organism might develop a stench so bad, that predators won't want to eat it. This phenomenon is called adaptation.