Human Biology isn't simple. We depend on a lot of body parts working together to make the whole body function normally.
Given all that, I would say that the brain was the most important part because it controls the rest of the body, eg the heart beat, the rate of breathing, digestion, fighting off infections, the hormones, blood sugar etc. All these things - and many more - rely on instructions from the brain in order to function.
The nose is a very important body part, but hearing is important, too.
what is the most important body part of a jaguar
They are important because they are part of your body
your heart and brain but really every part of you body is very important
heart
One of the more important body parts that starts with 'r' is the retina. It is an important part of the eye. Another important part are ribs.
Your hair.
Yes.
the fluke
the heart <3
cause it is a part of your body
because it looks after an important body part