A. Yes is correct.
Hope that helps!
An insertion mutation occured.
After the mutation, a letter was inserted, and the others remained intact. The number of letters increased by 1.
It is A. Lung tissue i believe.
Means they are related through a common distant ancestor. This shows that these structures (morphology) are homologous. They all have 7 neck (cervical) vertebrae, but giraffes cervical vertebrae are elongated compared to that of humans due to their adaptation as browsers .
