I think it’s the second one (duodenum)
Friction is a force that works against motion. While walking, friction helps us maintain our stability and prevents us from slipping. Friction also works the same way with cars and vehicles in general, preventing them from skidding and helping them stop when the brakes are applied. We also need friction to make a fire.
I believe that they always have the same number of chromosomes and kinds.
Before and after the patient coughs