White blood cells fight boy invaders to the body.
Melting ice would damage this polar bears habitat meaning the polar bear may decrease
Energy is the capacity to do some type of work
According to Ohm's Law:

Where: V = Voltage
I = Current
R = Resistance
As you can see here, you can say that Current is directly proportional to Voltage and indirectly proportional to Resistance. This means that as the voltage increases, current increases and as the resistance increases, current decreases.
So in your scenario, if the voltage remains the same, but the resistance is doubled, that means that the current will be halved.
So the answer to your question is 2. the current will drop to half of its original value.
Initial velocity = 5mph
final velocity = 7mph