The answer for this would just be your opinion. 
how confident are you in answering the question, if you are not confident than say you aren’t and try to explain it to the best of your ability.
        
             
        
        
        
6. A
7. A
8. ?
9. A
10. A
i know A being the answer for all is kind of weird but i am pretty sure that’s what the answers are
        
             
        
        
        
<span>Living Things interact in an Environment where there is water, soil, and</span><span>
 sunlight.
Hop this helps! :D
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Clues such as fossils such as bones, footprints, tar, etc,  preserved underground helped inform scientists. You can also count how old a tree is when you cut it open and there are some alive for thousands of years so that is a possible way.