What seems to be the differences between preserve, a reserve, or conservation land?

As explained below.

Explanation:

Conservation is generally linked with the protection of natural resources, while preservation is in focus of the protection of buildings, objects, and landscapes. And reserves are those natural resources that are found in the environment. Conservation follows the economic motive and preservation of the social motive.  While a reserve is retained or keep in sustenance and preserve is in general to protect like under some condition. Examples of forestlands are natural preserves as kept in strict controls and reserved forest lands are those kept for future purposes as in sustainable development.

Argon, carbon-14, and carbon-12