Question

Study the timeline. A timeline. 4. 5 billion years ago, Earth is formed. 4. 3 billion years ago, Earliest water. 4. 1 billion years ago, Single celled life. 3. 5 billion years ago, Earliest oxygen and photosynthesis. 2. 5 billion years ago, Complex single celled life. 1. 5 billion years ago, Multi cellular life. 500 million years ago, Land life. 300 million years ago, Dinosaurs. 200 million years ago, Mammals. 130 million years ago, Flowers. 5 million years ago, Humans. 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 1

Geological timeline is the chronological dating of the organisms and the geological happening in the orderly manner of the years and dates. The oldest mammals lived 200 million years ago.

What are the different species that arrived in the geological timelines?

5 million years ago humans arrived, 200 million years ago first mammal organism, 1.5 billion years ago complex single-celled organisms and 4.5 billion years ago Earth was formed.

The geological timeline is important as it portrays the presence and arrival of the organisms and the formation of some of the structures.

Therefore, mammals arrived at option B. 200 million years ago.

Learn more about the geological timeline here:

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