3. describe a chemical indicator. what is it? what is it used for? how does it work?

A way to test for the presence of chemicals. There is a strip that is blue or red and they test for basic or acidic chemicals. If they come In contact with the respective chemical to the strip color, then the color will change to something completely different to indicate that there is a chemical present

Dthrough a slow process

In some developing nations the percentage of the animal protein from fish in the diet can be as high as 25 percent.  about 85% of fish caught is used for human consumption.  the remainder is converted into fishmeal and fish oil.