"Preserve" is both a verb and a noun. As a verb it means to keep from deteriorating. E.g.
I preserved the evidence by putting it in an evidence bag.
I preserved the fossil by covering it up.
As a noun, it means a sauce made from preserved fruit. E.g.
I served ice cream with a preserve for a dessert.
"We must preserve the forest and not let it get cut down."
Scientists will preserve the dinosaur's bones to put in a museum.
Québec is the principal preserve of the French language in Canada.
I preserve my loving family.
Working for the forest preserve is voluntary.If you want to bring a dish, it is voluntary.
It's important to preserve our world's species.
Sodium is used in several forms to preserve food, such as sodium chloride and sodium nitrate.
One of my favorite things to do is walk through the wildflower preserve.
This law will help to preserve the old forests in the national parks
The pickles contained salt to preserve their flavor.
We preserved 10 bottles of peaches from our tree. Oil helps to preserve the wood.
To extend a fossils life you must preserve it.