42- 8 = 34 sand dunes must be the answer
hope so it helps
Answer:
to do day-to day activities easily and make surrounding comfortable for man
Explanation:
as an example , binary numbers help to work computers ,calculators.they help us lot .
scientific methods also need to write large and small numbers in short ways .so, scientists find various patterns .
72g H2O x 1 mol H2O/18.02g H2O = 3.99 mol H2O
