Question

multiple choice question
in animals, a complete ____ tract has two openings, one at the beginning called the mouth and one at the end called the ____
o digestive; anus
o digestive; pharynx
o respiratory; anus
o respiratory; pharynx

Explanation:

In animals, the digestive tract is responsible for processing food. A complete digestive tract has two openings. The mouth is where food enters, and the anus is where undigested waste exits. The pharynx is part of the throat involved in both digestion and respiration but is not the end - opening of the digestive tract. The respiratory tract is for gas exchange (e.g., taking in oxygen and expelling carbon dioxide), not for food processing, so the options with "respiratory" can be eliminated.

Answer:

digestive; anus