Can anyone help me please.

What was one step that charlemagne took to unite his kingdom? a. he chose a single strong heir to inherit his throne. b. he drove muslim forces out of europe. c. he created and supported schools. d. he declared himself head of the catholic church.

The social contact theory states that

The first thing that baby ducks usually see after hatching is their mother. they then follow their mother everywhere: into the pond, around the farm, and eventually through the air. this type of behavior is called