Is KBr ionic, polar covalent or nonpolar covalent

Acell in the human nervous system whose primary function is to form myelin and the blood-brain barrier, respond to injury, remove debris, and enhance learning and memory is called a(n) cell.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Drag each tile to the correct box. arrange the layers and faults from oldest to youngest.