Correct answer - C Energy Meter.
Why? - Energy meter are intended for energy measurements in three-phase electrical power network and can be used in residential, industrial and utility applications.
P = mv
This is a momentum question:
Momentum is always conserved so the momentum before and after a collision must be equal so:
The velocity of the two objects after they collide and dont stick together if no KE is lost is dependent on the mass of each of the objects by:

Where i is initial and f is final meaning before and after the collision
a group of cells that are similar in function, structure and origin.
Answer:
B. Antibiotics attack only bacteria. OR Colds are caused by viruses.
Explanation:
A.P.E.X.
Answer:The difficulty in developing vaccines against parasitic diseases is to identify (and produce) appropriate protective antigens because of the lack of complete understanding of the type of immune response required for protection.
Explanation:
I hope this kinda helps.