HELP please, Veternarian questions....?

Question

In digestion... in what order is protein broken down?
1. amino acids, peptides, polypeptides
2. polypeptides, peptides, amino acids
3. peptides, polypeptides, amino acids
4. polypeptides, amino acids, peptides

Would you say the team work between kidneys and bladder are an example of..
organ system, cell, organ or tissue?

Which do you think is exclusive to all living things?
energy production, movement, reproduction or changing the environment?

Thanks for your help!

Answer 1

1 polypeptides to peptides to amino acides.
2 The kidney and bladder are an organ system.
3 The long term goal of any living thing, plant or animal is to reproduce.