Evolution may be defined as the change in the species over several generation with respect to time. Natural selection may acts as the main driving force of evolution.
The evolution of organism can cause harm to other organism. The evolution of resistance strain of bacteria against a particular drug proves to be harmful for human. The drug cannot used to treat the bacterial infection further. The development of harmful chemical in eatable plant by the process of evolution can cause harm to the humans.
An important example of negative feedback is the control of blood sugar. After a meal, the small intestine absorbs glucose from digested food. Blood glucose levels rise. Increased blood glucose levels stimulate beta cells in the pancreas to produce insulin.
