The scientific method

is used to answer all problems
always begins with questioning
must be followed in the exact order every time
is a logical series of steps
ends with communication of results

the answer is A.) because the scientific method is used to answer problems.

This is the steps,

STEP 1: ask a question

STEP 2: state your hypothesis

STEP 3: conduct an experiment

STEP 4: analyze your results

STEP 5: make a conclusion

- decrease the number of plants and animals living in the water.

im pretty sure its b