Which rna brings instructions from dna

Messanger RNA

Explanation:

Messenger RNA carries instructions from the nucleus to the cytoplasm. The other two forms of RNA, ribosomal RNA and transfer RNA are involved in the process of ordering the amino acids to make proteins. RNA is a nucleic acid, like DNA, but differs slightly in its structure.

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.