Less Child Abuse issues, Less Car deaths every year due to Drunk Driving, and especially better environmental conditions for families.
B. One
because an independent variable is something you change. So in a scientific experiment you only change one thing. If you happen to change more than one thing then the test becomes unfair therefore you should repeat and make sure that only one thing is changed this time.
The answer is absorbing dead or decaying organisms
Pretty sure the correct answer would be Choice A
