Lol I just can’t with these

In the exercise for the week, read the sentence carefully concentrating on the word noxious. using other words or phrases in the sentence to compose a student friendly definition.

Bile juices in the breakdown of fats. an injury to the (liver, mouth, or salivary glands) may cause a decrease in the production of bile juices. this decrease in bile juices may lead to decreased production of (amino acids, carbohydrates, or fatty acids)

How did the scholars date the mosaic?