Real world example of endoplasmic reticulum

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Are the earth's ocean floor and continents the same age geologically? why or why not?

What is the starting point in replication called