premise: if two species of animal have a similar bone structure then those two species probably evolved from a common ancestor in recent geological history sent2: a rhinoceros is a kind of animal sent3: number of toes is a property of bone structure sent4: a horse is a kind of animal sent5: an odd number of toes is a property of rhinoceroses sent6: an odd number of toes is a property of horses sent7: rhinoceroses and horses have similar digestive systems sent8: rhinoceroses are a kind of organism sent9: horses are a kind of organism.
hypothesis: producers are important to an ecosystem because they provide energy to consumers