Correct Answer: Option A

Explanation

The mammals are believed to have evolved from Therapsid (mammal-like) reptiles some 220 million years ago in the Triassic period, before the first birds.

So, the correct answer is 'Reptiles'

A major transition in the evolution of life occurred when mammals evolved from one lineage of reptiles. This transition began during the Permian (286 - 248 million years ago) when the reptile group that included Dimetrodon gave rise to the "beast-faced" therapsids. (The other major branching, the "lizard-faced" sauropsids, gave rise to birds and modern reptiles). These mammal-like reptiles in turn gave rise to the cynodonts e.g. Thrinaxodon during the Triassic period.

• What can i study with 155 score in science course? Answer this

  1 Answers   ·   Biology   ·   2 days ago
• what is the fluid in the eye calles? Answer this

  1 Answers   ·   Biological Science   ·   17 hours ago
• which school is the richest school in Nigeria? Answer this

  1 Answers   ·   1 day ago