What is the difference between normal and sickle hemoglobin at the dna, rna, and protein (amino acid) level?

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism

Plz ! ive been stuck on this forever

What is the correct trna sequence that would match the following mrna sequence.gcgaua