An ethical concern is a problem that requires someone to choose between alternatives to label something as "right" or "wrong", hence the ethical part.
So, I assume that ethical concern, regarding research, is when you must label different sources as obtaining proper information, or if it's incorrect(?).
I'm only guessing here, sorry, but that's the best I have.
The Soviet Union experienced a crisis due to economic waste. The socio-cultural crisis in the USSR occurred because of class division, the low quality of people's lives, and the government was not allowed to develop people's creativity. In particular, the system named Glasnost and Perestroika which was proclaimed by President Gorbachev was the trigger for the explosion of social revolutions in Eastern European countries.
In both species repeated pairing of a CS and US eventually produces a CR in response to the CS alone. In the sea-slug this is a very direct process, in the species we have been discussing in these lectures - rats, dogs, humans and so on - I hope you have seen that it is far from being so simple.
An aging population, a high infertility, and a lack of food and water.
