Answer:
For the two rivers its 
<em><u>Huang and Yangtze rivers</u></em>
the longest river is <em><u>Yangtze river</u></em>
Why the two rivers were important was because <u><em>the Yellow River to the north and the Yangtze River to the south. These major rivers were a great source of freshwater, food, fertile soil, and transportation.</em></u>
And I'm pretty sure what they meant by what the names were for the scientists is <u><em>Archaeologist</em></u>
<u><em>Have a great day a god bless, I'm a Hebrew and god has done great things to me so have faith in him and be strong don't give up because Yeshua ( Jesus) got up so that we could get up again</em></u>
Explanation:
Hope this helps, PLEASE MARK BRAINLIEST!!! SORRY IM LATE
 
        
             
        
        
        
Answer:
1) cos more than expected 
2) Olympics.....
3 though host cities 
Explanation:
 
        
             
        
        
        
A widely accepted way of thinking or behaving is a convention.
It denotes set of generally accepted standards and norms and a way in which something is usually done. Example for convention is shaking hands when greeting someone. Controversial on the other hand is something causing people to have opposing ways.
 
        
             
        
        
        
The statement that is true
regarding restrictive adjectival clause is it will follow a general noun and is
not set off by commas. Restrictive adjective clause limits the meaning the noun
it modifies. Unlike Nonrestrictive Adjective Clause, the Restrictive clause
should not be set off by commas. 
 
        
             
        
        
        
Demonstrating bravery huh? It doesn't seem too hard to explain. Say, for example your talking about a fictional story, right? Depending on what that said character does, depends on his/her bravery for he/she did. If you can implement something similar to that in whatever it was you had in mind, it might help. 
I really hope this helps.