Answer:
Becuase in canada here it snows and yeah. 
Explanation:
 
        
             
        
        
        
Answer:
Through photosynthesis, organisms could use sunlight to make food from carbon dioxide and water. 
They provided food for themselves 
Explanation:
 
        
             
        
        
        
Im not sure but if you think of it, the one that you didn't put any salt is a independent  variable because it doesn't really rely on anything it doesn't have salt. The Dependent variable would be the 2nd and the 3rd cup because it doesn't have much salt but the 4th cup has lots of salt so its basically controlled. Hope it helps !
 
        
             
        
        
        
First pic :
plants do not have cell membranes
(plants have BOTH cell membranes and cell walls)
second pic:
ATGC
(opposite strand of the DNA TACG)
third pic:
the second choice
(selectively permeable means only specific molecules could get in and go out)
fourth pic:
option 2 
(cellular respiration takes sugar (or food) and makes it into ATP energy. this is what makes us have energy after we eat)
I really hope this helped :))