That is called an insertion mutation which is a type of a frameshift mutation
depending on where you put the extra nucleotide, the amino acid sequence may look different.
What he did was say that evolution happened that over time the birds seemed to be changing
Answer: Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level. Trophic level transfer efficiency (TLTE) measures the amount of energy that is transferred between trophic levels. or in materials that the consumer does not digest, or through movement
Hope it helps! ^w^
