Answer:
One can't know the evolutionary relationship, the anatomical structure and embryological relation.
Explanation:
There are different types of animals on our planet. Therefore, they have classified into different classes. The five-kingdom classification is the most accepted classification system. The classification can't be based on appearance only as many organisms similar in appearance but their function and nature are different. For example, the birds, bats, insects, and dragonfly can fly and they are not a single type of animal group. Their anatomical structure is completely different from each other. The tadpole larva and fishes appear similar but they belong to different classes. We can't know their ancestors, from their appearance which is important for the animal classification. Many animals share a common habitat, therefore they are having a similar resemblance.
