Climate Change - Push for more sources of sustainable or green power sources like wind and solar. 
Plastic in our oceans hurting wildlife - Use less single use plastics and also resuse plastics so there are less plastics in our oceans
        
             
        
        
        
You need to test the hypothesis several times and record all results. Once you obtain the same results several times, I think that means its a theory
        
             
        
        
        
Seymour Benzer used phage T4 mutants, Experimental
evidence that a gene is a linear sequence of nucleotide pairs. Some regions of
chromosomes have "hot spots" for mutations. Benzer's experimental
approach to fine structure mapping of the rII locus.  Generated 1612 spontaneous point mutations
and several deletions in rII locus identified two complementation groups, rIIA
and rIIB.  Mapped locations of deletions
relative to each other using recombination. 
Mapped locations of point mutations relative to the deletions. Tested
for recombination between all point mutations within the same complementation
group. 
 
        
             
        
        
        
AGCT. Adenine, Guanine, Cytosine, Thymine.