Agene is a region of dna that contains instructions for the manufacture of?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Which particle controls what element an atom is?

Land conservation is a worldwide priority. there are several methods to prevent the loss of land due to a variety of reasons. which method is not a way to conserve land? a) sea walls b) rainwater harvesting c) limits on clear cuts of forests d) cut and burn methods of clearing land