Question

What is the correct sequence of origin of mammals?

• A. Sauropsids $\to$ Pelycosaurs $\to$ Therapsids $\to$ Mammals
• B. Synapsids $\to$ Pelycosaurs $\to$ Therapsids $\to$ Mammals
• C. Sauropsids $\to$ Synapsids $\to$ Thecodonts $\to$ Mammals
• D. Synapsids $\to$ Sauropsids $\to$ Therapsids $\to$ Mammals

Answer 1

The correct option is B Synapsids $\to$ Pelycosaurs $\to$ Therapsids $\to$ Mammals

Synapsids are primitive reptiles from which originate Pelycosaurs, which are also reptiles. From these, develop more advanced mammal-like reptiles called the Therapsids and then finally develop the Mammals.

So, the correct answer is 'Synapsids → Pelycosaurs → Therapsids → Mammals'.