The internal diameters of the pipes vary depending on their size.

I bought some ink bottles for my calligraphy project.

Many animals exhibit internal fertilizations.

I need to get insurance shots before I travel.

The website has many internal links that help users navigate between different pages.

Many internal-combustion engines are used in cars and motorcycles.

The internal energies of the system are constantly changing.

Internal migrations have increased in recent years.

There are many Jack-in-the-pulpits growing in the forest.

Jacks-in-the-pulpit are unique flowers that can be found in wet woodlands.