The idea that the sequence of bases in dna specifies the sequence of bases in an rna molecule is called

Transcription

Explanation:

DNA specifies the sequence of bases in the messenger RNA (mRNA) by a mechanism called gene transcription. Subsequently, this messenger RNA molecule specifies the polypeptide chain. This flow of genetic information (i.e. DNA > RNA > protein) is known as the central dogma of molecular biology  

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.

that is wrong, its not thymus.