Gravity causes all types of mass movement. Mud-flows, landslides, creeps, and <span>slumps can all be causes by gravity.</span>
Vascular tissue is located inside the pericycle of a root, which I believe would be considered the inner layer.
Anthropoid
Pretty sure that is right B/C they have a exoskeleton, they are land animals primarily (Oxygen Tubes), they have joints and have two body segments.
I would say C because it makes the most sense.. good luck!