Answer:
b
Explanation:
B
In order for any conduction to take place it needs to go through a solid. Therefore it cannot travel through empty space
60 elements! I don't exactly know every element known, so if you are asking that, please tell us, but what I do know is that there were 60 elements in the periodic table by 1860.
here's the answer to your question
The si unit used to measure weight is kilogram /kg
