Which animal is responsible for causing the disease elephantiasis? elephants monkeys gastropods roundworms

Option D, roundworms

Explanation:

Elephantiasis is a disease which caused by round worm known as filarial worm. These worms are spread through a vector agent i.e a female mosquito. A parasite growing with in the worm causes this disease which leads to  extreme swelling in the arms and legs. It is transmitted from one human to other through mosquito bites. The worm lives in lymphatic system of humans from which it gets nourishment.

Hence, option D is correct.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%