Which practice is not an effective way for people to influence goverment policies

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass

Could we see a galaxy that is 20 billion light-years away?