ီDifferences

What is the diffenences?At which things can be defined the different?At sciences it's easy to know
b coz there are standards for each matter.Who started defined the standard and differences between humans.For materials it's easy to classify.why? b coz their abilities and qualities are constant.For the alives,especially humans how we can classify?Humans qualities and ability aren't constant.They are depend on circumstances and situations,and their enviroments.Nobody can predict,what will happen tomorrow except Buddha.Why did i introduce this paragraph?
I need to know the differences bet^n humans.And if there have a reactions all of actions.According to Sciences view, all of actions have reactions said Newton.For sociality can it be true?
How can we classify that Romeo love Juliet and Datha Giri love to Malthida.On my opinion,Romeo and Datha have same amout of love for their sweetheart.Do u accept that love have amout?But why did all of persons sait that Datha was a villain.Although Datha so loved malthida,but reaction from malthida was so bad.
I can't understand.