Although they are related, the digestive system of an earth worm and ascaris are very different. why do you think that is?

Although Ascaris sp. and Earthworms are both nematodes, they have different digestive system. An earthworm has pharynx, esophagus, crop, intestine and gizzard. While the ascaris has only mouth, pharynx, intestine and rectum. It is because of their diet, or the type of food they ingest. The earthworms eat on sediments while an Ascaris sp. is a parasite of the intestine in humans and other animals.

Everything that you need in a lab is in your lab

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.