Observe the following pictures and discuss the characters observed:

• Some plants and animals show some morphological characters by which they can be related to two different groups; hence they are called as ‘connecting links’.
• Duckbill Platypus lays eggs like reptiles but has mammary glands and hairy skin like mammaks.
• Thus, Duckbill Platypus is a connecting link between reptiles and mammals.

• Unlike other fishes, Lungfish has lungs for respiration like amphibians.
• Thus, Lungfish is a connecting link between fishes and amphibians.

• Peripatus has a segmented body, thin cuticule and parapodia. These are the characteristics of annelida.
• Also, it has open circulatory system and tracheal system for respiration. These are the characteristics of arthropoda.
• Thus, Peripatus is the connecting link between Annelida and Arthropoda.