The answer to your question is supply invoice
The molecules that brings amino acids to the ribosomes are the tRNA molecules.
Answer:
"U"-shaped, with peaks at the low and high extremes of beak size; disruptive selection
Changes in the dna are called mutations. They can occur spontaneously. Mutations can only be passed down in gametes--sperm and egg cells. with Darwins theory at mind a mutation needs to pass the test of natural selection to remain in the gene pool. So purposly making mutation or altercations may end in diseases/illnesses or in some cases death because they body can not take it.....hope this helps if it doesnt im sorry!
