The independent variable is the one that can be changed
I think the correct answer would be water temperature because on the table, the water temperature is increasing by 10 each time so it is changing. 
hope I'm right and hope I helped :)
        
             
        
        
        
An organism<span> is a living being that has a cellular structure and that can independently perform all physiologic functions necessary for life. In </span>multicellular organisms<span>, including humans, all cells, </span>tissues<span>, </span>organs<span>, and </span>organ<span> systems of the body work together to maintain the life and health of the </span>organism<span>.</span>
        
             
        
        
        
The mRNA needs to copy the gene sequence of the dna before it leaves the nucleus to the tRNA and rRNA
        
             
        
        
        
It needs to reach out long to eat the leaves on the tree