A partial solution to the energy crisis lies in better energy conservation.
conservation?
Product
It's obvious that you don't know how to use the word obvious in a sentence because you asked a question on how to use it.
catalyst
The law of conservation of matter states that in a chemical reaction, matter is neither created nor destroyed.
the conservation for gas is cars
I was shocked, wow what a Conservation! Conservation escalated very quickly.
Protecting the world's wildlife is conservation
This bridge was built by the Civilian Conservation Corps in 1941.
how do you make a conservation of mass into a sentence
Conservation is the word.
You can use the word Truss in a sentence like this.
Can you use the word concluding in a sentence? Done.
Just use it! Or do you mean, can you use the word beheld in a sentence.
How do you use the word decibel in a sentence?What is decibel used for?
You can use the word Terrorist in a sentence as " Muslims are not terrorist ".
You just did use the word colonize in a sentence.