Cells can make new cells. One cell can (a) into two new cells. This is called (b). The process of cell division goes through various states. First, the cell nucleus (c) into two. A new cell surface membrane then (d) the cell divides. The two new cells are called (e) and they are small. They will grow and become larger. They grow by getting (f) from the food that is eaten. Once they grow to full size they can also (g). If cells divide more quickly than they should, or divide in the wrong way, (h) can develop.

the correct answer is option d. none of these. it is noted that options a, b, and c share the same content.

despite the valid answer provided at the last sentence of each of the options, a question/answer format shouldn't include humourous themed responses such as "you bet your thermal pj's we do." - unless of course, the answer is carried out in an informal environment. this could be replaced with a simple "yes" or "it is necessary".

the question should be re-phrased to a more appropiate syntaxis. instead of "do we need the greenhouse effect? ", it should be written as "is the greenhouse effect necessary? " in order to give it a general scope, instead of limiting the answer to the needs of "we" the humans.