The abbreviations for a tetragram, a nanosecond and a kiloliter are as follows:
Tg ,ns and kl.
Nanosecond is *10-9.
One teragram is ten raised to the power of 9 and one kiloliter is equivalent to one thousand liters.
I think its the Diurnal Cycle.
The answer is most simply A
Answer: The systems regulate the house, the same way our body system helps regulate our body. If it wasn’t for the electrical system, plumbing system, heating, and cooling system the house wouldn’t be regulated or able to live in. Just like if our bodies isn’t being regulated, we can't live.
I hope this could help you! ^^