The Mesozoic Era began about 250,000,000 years ago. The Palezoic Era began 292,000,000 years before that. How long ago did the Palezoic Era Begin?

A. 42,000,000 Years

B. 492,000,000 Years

C. 542,000,000 Years

D. 556,000,000 Years

Add the two numbers. What do you get?

To find out how long ago the Paleozoic Era began, we can subtract the number of years between the Mesozoic Era and the Paleozoic Era from the starting point of the Mesozoic Era.

The Mesozoic Era began 250,000,000 years ago.

The Paleozoic Era began 292,000,000 years before the start of the Mesozoic Era.

To find out how long ago the Paleozoic Era began, we subtract 292,000,000 years from 250,000,000 years:

250,000,000 - 292,000,000 = -42,000,000

Since we can't have a negative number of years, we need to convert it to a positive number. To do that, we need to take the absolute value of the result:

|-42,000,000| = 42,000,000

Therefore, the correct answer is A. 42,000,000 Years.