Replanting trees on a bare hillside is an example of A) conservation and refforestation
B) preservation and conservation
C) restoration and preservation
D) refforestation and restoration ​

A

Explanation:

firstly, conservation because by planting trees, the land dat was once proned to erosion is covered thereby conserving de land and reforestation because, u hv replaced trees dat were once cut there

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

that is wrong, its not thymus.