Answer:
C. Air Pollution because light is needed to do photosynthesis as well as carbon dioxide. Temperature is also affecting the rate of photosynthesis (temperature too high the enzymes are denatured) so the answer would be C. 
 
        
                    
             
        
        
        
Answer: When we look at cells under the microscope, our usual measurements fail to work. In  objectives we use (4X, 10X, 40X and 100X) arm.  
At 100x magnification you will be able to see 2mm. At 400x magnification you will be able to see 0.45mm, or 450 microns. At 1000x magnification you will be able to see 0.180mm, or 180 microns.
Hope this helps
 
        
             
        
        
        
What does this mean for us? Water's polarity allows it to dissolve other polar substances<span> very easily. When a polar substance is put in water, the positive ends of its molecules are attracted to the negative ends of the water molecules, and vice versa.
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ALL PROTISTS ARE UNICELLULAR AND MICROSCOPIC IN NATURE, is the correct answer.
Protists are diverse collection of organisms which are primarily microscopic and unicellular in nature. Protists are scientifically categorized as eukaryotes and one definition of protists states that prosists are all eukaryotes organisms that are not animal, plant or fungi.
        
             
        
        
        
<span>This may help...
This is an example of incomplete dominance, where the heterozygous condition has its own phenotype, in this case, pink. CA = white CB = Red CA CA CB CA CB CA CB CB CA CB CA CB CA CB = Pink CA CB CA CB CA CB CA CACA CA CB CB CA CB CBCB 25% will be white CACA, 25% will be red CBCB, and 50% will be pink CA CB.</span>