Robert practiced taking a few steps to one side of the stage each time he started a new point of his speech. He is engaging in .

He is engaging in a "MOTIVATED MOVEMENT".

Explanation: Motivated movement is the way we express our emotions, thoughts, needs, and points, while keeping the body in motion. It helps to motivate a speaker with boldness, on how to deliver a particular point, so that the audience will have a better understanding. it is also know as walking during transmission of points.

For Robert to walk from one side of the stage to another, whenever he want to start a new point, means that Robert wants to motivate himself to be able to express the point.

a. the moon was locked into orbit by the earths gravity as it was passing by and capture hypothesis i think

i’m   sure probably just geuss and see which one you can get right, i’m pretty sure it is the combination of goods and services