echidna and ornithorhtnchus are the connecting links between

Options

A. Amphibians and aves
B. Mammals and amphibians
C. Reptiles and mammals
D. Reptiles and amphibians

Answer

C

Explanation

Ornithorhynchus resemble reptiles in having a large coracoid in the pectoral girdle and are oviparous and moreover presence of mammary gland, hair, diaphragm, single aortic arch etc.