Their ears, of course.
They use their eyes
no
People can use the fur, the meat and the milk. Llamas can also be used as pack animals.
Llamas
One structure that does both of these is called the LATERAL LINE.
No, because the use now would be the use then which is not really vestigial.
You use "te llamas" when asking someone's name directly, like "¿Cómo te llamas?" meaning "What's your name?" You use "se llama" when referring to someone else's name, like "Él se llama Roberto" meaning "His name is Roberto."
They Use their knees and instincts
by llamas
Most important appendage which Arthropods use for sensing environment is antenna .Antenna is head appendage used to sense sound chemicals heat etc.
Llamas, alpacas.
Hearing is the most valuable sense to a dolphin, as they use echolocation to navigate, communicate, and locate prey in the ocean.