The intestinal parasite Ascaris lumbricoides currently infects more than one billion people. Which group is it in?

A) flatworms
B) roundworms
C) annelids
D) cnidarians
E) arthropods

Ascaris Lumbricoides

A type of roundworm, or helminth, that can cause the disease ascariasis when it infects a human host's intestines.

Roundworms

Roundworms are a type of nematode, a cylindrical worm found in various environments, some of which can infect humans and animals causing diseases.

Intestinal Parasite

Organisms that live and feed inside the human digestive tract, often causing illness or nutrient deficiencies.