Answer:
They help readers connect to the idea that human eyes cannot see everything.
Explanation:
The sentence "Moreover, it is probably just as valuable or more valuable to us now, than it was in the ancient past".
Sure! First, you find a common denominator for all of the fractions. If you don't know how, search online. When they have the same denominator and they are equivalent fractions, subtract the numerator and keep the denominator. That is your answer!