Question

Write short notes based upon the information known to you.

Connecting link

Answer 1

Connecting link: It refers to organisms which show characteristics related to two different groups.
For example, Peripatus is considered a connecting link between Annelida and Arthropoda. It has characteristics like segmented body, thin cuticle and parapodia-like organs which are similar to annelids. It also shows tracheal respiration and open circulatory system which is similar to arthropods. Another example is duck billed Platypus which is a connecting link between reptiles and mammals as it lays eggs like reptiles and has mammary glands like mammals.