Question

The objects in a collection have exactly the same properties. Is it possible to classify them into different groups?

Answer 1

One set of properties may be the same. However, some other properties may be different. For example, a frog is classified as an animal and so is a snake, but a pitcher plant is classified as a plant. Now, if we make a classification of insectivores (insect eaters), then the frog and the pitcher plant will be classified together.