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For example, a species like dogs includes all individual dogs with similar physical characteristics, behaviors, and genetics. On the other hand, a group of dogs could refer to a collection of dogs that are trained to perform in a show, or a group of dogs from the same breed living together in a neighborhood.
In summary, a species categorizes organisms based on their similarities in genetics and physical traits, while a group can refer to any collection of individuals or objects that share a common characteristic or purpose.