The scientist studying the brain would be part of the nervous system.
Criminals would have been killed because of their crimes, but this would have been part of the justice system, not part of the Holocaust, people were only killed for being Jewish in the Holocaust.
The word studying is a verb. It is the present participle of study.
Cataracts in the elderly are so common that they are thought to be a normal part of the aging process.
yes it is a part of social sciences
That's part of the field of Astronomy.
All criminals are allowed a lawyer that is part of the maranda rights. Also they get a public defender if they can not afford a lawyer. Lawyers are not just for the guilty they are for the innocent as well.
gulibility
No. The police officer has a duty to protect the public from the criminals. Criminals are also part of the public, and the police do not have to help the criminals make good decisions. Police interrogators are not required to assist criminal suspects, but instead are permitted to trick them into confessing.
The answer will depend on where you are studying.
Sampling
As with most eastern Europeans, Bohemians take care of their elderly with love and compassion. It is a mark of their culture that the elders are considered a major part of life.