Final answer:
The correct answer to the question is A) Muskrat. Muskrats are marsh-dwelling rodents with 'rat' in their name, distinguishing them from the other options provided.
Step-by-step explanation:
The question is asking which marsh-dwelling animal with 'rat' in its name is classified as a rodent. Rodents are a group of mammals known for their gnawing habits, characterized by a pair of continuously growing incisors in each of the upper and lower jaws. This group includes a diversity of animals, such as mice, squirrels, beavers, and of course, rats. When it comes to the options provided:
A) Muskrat - Is indeed a rodent that lives in wetlands and has 'rat' in its name.
B) Nutria - Also known as coypu, is a rodent, but does not have 'rat' in its name.
C) Beaver - While a rodent, it does not have 'rat' in its name.
D) Capybara - The largest of the rodents, but again, without 'rat' in its name.
Therefore, the correct answer is A) Muskrat, which is a marsh dweller with 'rat' in its name and belongs to the rodent family.