study the timeline. based on the timeline, about how many years ago could the oldest mammalian organism have…

study the timeline. based on the timeline, about how many years ago could the oldest mammalian organism have lived? 5 million years 200 million years 1.5 billion years 4.5 billion years

study the timeline. based on the timeline, about how many years ago could the oldest mammalian organism have lived? 5 million years 200 million years 1.5 billion years 4.5 billion years

Answer

Explanation:

Step1: Recall mammalian evolution knowledge

Mammals first appeared around 200 million years ago.

Answer:

200 million years