What is the name of the indicator species in milk?

Indicator species are those bacteria which, if found in certain quantities, indicate that the food, water, or milk may not be fit for human consumption. Among the most common indicators are the coliforms, an example of which includes Escherichia coli (E. coli).

Explanation:

Took the test just now

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)