If you represented earth's history by a line that is 2 m long then, the segment length in 400 million years will be 43.2 cm.
The entire history of the Earth is represented by a line 5 meters long.
The age of the Earth is 4.6 billion years.
That means a length of 5 meters or 500 cm (1m = 100cm, so 5m = 5× 100 = 500 cm) represents 4.6 billion years, i.e 4600million years. (As 1 billion years = 1000 million years)
We have to calculate the length of the segment for 400 million years.
In 4600 million years, the segment length is = 500 cm
In 1 million years, the segment length will be = 500 / 4600 = 0.108 cm
In 400 million years, the segment length will be = 0.11 × 400 = 0.108 × 400 = 43.2 cm
Therefore, the segment length in 400 million years will be 43.2 cm.
To read more about Earth, visit https://brainly.com/question/2616081
#SPJ4