Answer:
D. Gravity.
Explanation:
Gravity is the force that holds objects that attracts objects. Planets are bound to their star because they are attracted to it.
I would say <span>A) perceptual region</span>
Answer:
In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. A crystal structure is composed of a unit cell, a set of atoms arranged in a particular way; which is periodically repeated in three dimensions on a lattice.
Explanation: