Answer:Flouride it creates enamel.
Explanation:
enamel (that's the tooth's hard outer surface) more resistant to acids produced by the bacteria living on the teeth and gums.
Answer:
they require more testing in real-word conditions
Explanation:
One of the biggest reasons for this very slow uptake of hydrogen vehicles is the existing infrastructure. ... The sceptics' first argument against hydrogen vehicles is that they're less efficient than EVs are. Because hydrogen doesn't occur naturally, it has to be extracted, then compressed in fuel tanks.
I'm not completely sure but I think it is 27.4572. Hope I helped a little.
I believe your answer is A. Octane
