Answer: I think the unknown substance is water.
Explanation: mark me the brainly-est
The ancient Greeks represented fractions by writing the denominator with a single or double accent. <span>Other fractions were often indicated by placing a single accent on the numerator and writing the denominator twice, each time with a double accent.</span>
Answer:
The decline population growth is likely due to a confluence of factors: lower levels of immigration, population aging, and declining fertility rates.
