In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.

[EX Q]: Question: A doubling of carbon atoms in a hydrocarbon will cause _____ isomers. 
 Answer: more
[EX A]: As you increase the number of carbon atoms in a hydrocarbon, the number of isomers quickly increases.

[EX Q]: Question: If Mona's body experiences less volume of blood in her blood vessels, what is happening to the pressure in her vessel walls? 
 Answer: decreasing
[EX A]: This is because the lower blood volume in the vessels exerts less pressure on the vessel walls.

[EX Q]: Question: Eric saw a shell of a snail that was very rare in fossil form. Compared to one that is more common, the rare snail has a shell that is _____ hard. 
 Answer: less
[EX A]:
Hard shells fossilize more readily than soft bodied organisms, as they are better at resisting decay, take significantly longer to break down, and have a greater chance of surviving burial under layers of sediment.