C. A combined circuit
That’s the answer
To make sure that we have enough resourses to sustain ourselves. You see, if we use up, say, all water on earth, then obviously we won't have any more and we'll die.
To calculate the volume of a rectangular, we have to multiply the value of height, length and width.
8x5x4 = 160 cm ^3
An atom's mass number equals the number of protons plus the number of neutrons.
Hope this helps! (:
Answer:
C
Explanation:
It has to travel 600 light years before we would be able to observe the explosion.
