Step-by-step explanation:
Darwin, is a brilliance ahead of his time.
He has proven evolution by his observations in the field. EXAMPLE/
He started with plants..a control group & experimental plants he grew himself. After that, he has proven, (evolution theory with environmental variances determines how animals adapt to a new environment)... it is not possible to grow a tropical plant in the midwest without warmth, humidity, water etc...
He had proven through his observations that giraffes have long necks so they can reach the higher branches of food while living in arid climates.
While his counterparts disagreed, he had visited these places worldwide 2 study this.