Answer: D. better soil for growing food
Explanation:
400x because you have to multiply that 40 by that 10
"By working together voluntarily" is the statement among the choices given in the question that <span>best explains how railroad companies were able to standardize their timetables in 1883. The correct option among all the options that are given in the question is the second option or option "B". I hope it helps you.</span>
Explanation:
1. provides more efficient supply level of oxgen.