Answer:
The answer is D.
Explanation:
Sewers are connected to households and usually roads. When rain comes down, it goes down the drain in the road which leads to the sewers. The same thing happens with the answer C. A, household waste water, is connected to the sewers as well. So, since all three of these are correct, you would choose D.
Hope this helps.
DDT has adverse affect on our environment due to its presence for a long time.
<h3>What is DDT?</h3>
DDT is an insecticide that can pass up in the food chain i.e. from insects to small birds, and then from small birds to big birds like hawks. High concentrations of DDT in birds leads to weakness in the egg shells.
This leads to a decrease in their population so we can conclude that DDT has adverse affect on our environment due to its presence for a long time.
Learn more about insecticide here: brainly.com/question/6589507
C. The shape of a protein allows it to perform several different jobs.
Here are 3 principles! Hope this helps!!
1 all living organisms are compound by one or more cells
2 the cell is the structure and functional basic unit of life.
3 all cells originated from other cells
