Are roundworms parasites to animals only?

That's not quite right. While roundworms are primarily parasites of animals, including humans, there are some species that can also infect plants.

Here's a breakdown:

* Animal parasites: This is the most common type of roundworm. They infect a wide range of animals, from small invertebrates to large mammals. They can cause various diseases, often by consuming nutrients from their host or blocking their intestines.

* Plant parasites: These roundworms are often called "nematodes" and are microscopic. They can infect the roots and stems of plants, causing damage and stunting growth.

So, while the majority of roundworms are animal parasites, a small but significant number can also affect plants.