Answer:
um you don't have the answer to choose from so I looked up on the web and its says ( migrants are more prepared to take on low-paid low-skilled jobs - helps to reduce any labor shortages) I'm pretty sure this didn't help but I hope it did
I believe this is because the frameshift mutations can affect many amino acids.
Frame shift mutation is produced by either insertion of deletion of one or more new bases. Since the reading frame begins at the start site, any mRNA produced from mutated DNA sequence will be read out of frame after the point of the insertion or deletion, thus producing a nonsense protein.
The answer is serous membranes.
Hope it helped!