The expression of a gene is said to be ‘turned on’ when certain signals interact with the promoter of a gene and RNA is produced. The strand of RNA that corresponds to a gene is complementary to the sequence of DNA. The process called "Transcription" is:

Transcription is the process of forming an RNA molecule from a DNA template molecule. In this process, the DNA strands separate and one serves as a template for the RNA, while the other is inactive. At the end of the transcription, the tapes that were separated are joined again.

Explanation:

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

what are the awnser choices? i mean, without choices, it is an incompleat