It's inappropriate for a teacher or teacher aide to
a. display appropriate affection in the classroom.
b. compare one student's work with another.
c. joke around with students in the class.
d. write notes of appreciation to students.

b. compare one student's work with another.

Under the professional ethics, confidentiality of one's work should be respected and appreciated no matter the rating is. 
Proper response of the teacher is encouraged.

Morals or values of conduct matters in doing scientific investigation. It protects the rights of the living organism that is being studied in the research and when the writer suggests, living organism. It is either human, animal or plants. Stewardship is always important as valuing and curiosity. Main issues nowadays concerning scientific investigations implies: 
1.       Animal care. Some areas abuse the study of animals, the species may include rats, cats or dogs, or any other animal of the matter. 
2.       Human subjects. This is a crucial process when confronting developing research under human beings. Respecting their rights as individuals –persons- and confidentiality of any leaked information that has come out of the research.