What do motor nerve cells do? A. carry messages from cerebellum to cerebrum
B. carry messages from brain to the organs and tissues in the body
C. carry water to the well
D. send messages to the brain stem

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent