teratoma. a type of germ cell tumor made up of a number of different types of tissue from one or more of the germ cell layers; it is usually found in the ovary or testis and may be either benign or malignant.
The first and the most dangerous effect of watching too much of television is mass physical degradation in our society. People, who spend hours and hours in front of the TV sets, are under very high risk of becoming overweight and obese.
It is reasonable to think that the more TV you watch, the less time you spend studying, resulting in low test grades. However, it does not seem like these variables will be strongly correlated, since some people do not watch TV but do not spend time studying either.