That's hard. The action might be when you go to lift your feet off the ground and the reaction force is letting your feet touch the ground again while taking a stride. Hope this helps.
        
             
        
        
        
The same principle apply to stereo microscopes, a 10X eye piece combined with a 4X objective lens will produce 40X magnification.
        
             
        
        
        
Answer:
Explanation:
Look into Antimicrobial Peptides and the usage of yeasts to fight the bacterial resistance to antibiotics. Due to the rising bacterial resistance, scientists are using Antimicrobial Peptides (AMPs) as an alternate way to fight this crisis. 
Where does yeast come into play?  Yeasts are becoming a go-to organism for genetic engineering and recombinant protein production and a source to idenitfy how these AMPs work so that we could possibly target those pathways.
Read the "Antimicrobial Peptides: Recent Insights on Biotechnological Interventions and Future Perspectives" journal article to see if this is something you would like
 
        
             
        
        
        
Answer:
B.) Can lead to new species that share common ancestors
Explanation:
Genetic drift and natural selection both lead to evolution. This describes the change of a species overtime to be better suited for their environments. In some cases, this leads to the creation of an entirely new species (speciation).