Answer:
Body language.
Explanation:
If you see someone nervously wringing their hands, you can assume they're worried about something. If you see someone crying, the obvious assumption is to believe they are sad about something.
<span>Hydrogen is the answer</span>
PSA: Public Service Announcement
Explanation:
lagrange equation is important for solving optimization problems in which given some functional,one seems the function minimizing or maximising it.