Calculate the atom economy for this reaction (LaTeX: A_E={M_{product} \over {\sum{M_{reactants\cdot 100\%A E = M p r o d u c t ∑ M r e a c t a n t s ⋅ 100 %). Report your number to two significant digits.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

the answers would be

the first one and the second one

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)