Question

nematodes have a complete digestive system that runs through their body. the mouth is at one end and the anus is at the other end. on which end is the anus?
the posterior end
the anterior end
image from www.usda.gov

Explanation:

In nematodes, the anterior end is where the mouth is located (associated with the front/head - like region for feeding), and the posterior end is the opposite end. Since the mouth is at one end (anterior) and the anus is at the other, the anus is at the posterior end.

Answer:

the posterior end