earth is 4.5 billion years old. life appears in the fossil record 3.8 billion years ago. What percentage of parts history was without life?

Question

show formula to find answer

Answer 1

no formula needed, only common sense.

 

 

Of the 4.5 billion years, there was life only for 3.8 billion years so the difference, 0.7 billion years, must have been time when Earth was not graced withlLife as we know it.

 

The ratio of non-life years to all of the Earth's years is 0.7/4.5 and you can compute this ratio, and then move the decimal point to get the percentage of time with non-life on Earth.