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The backbones are part of the skeleton.
The largest internal part in your body well.................let's see...............when people mean part, sometimes that can mean an organ or a body part like a leg, arm, or head. The biggest internal organ in your body is your heart. The biggest internal part would probably be your muscular system or skeletal system.
Yes they have a backbone. You can't see it because of his shell that protect them. Thanks!!
Skull bones protect your brain.
Kidneys
skin
The integumentary system is composed of various body parts, including your skin, hair, nails and sweat glands. The integumentary system acts as a protective barrier for your body. The main functions of the system are to maintain body temperature, protect your internal organs, eliminate wastes from your body, protect you from disease and retain bodily fluids . Hope it helps!
Its exoskeleton.
Eyelids and Eyelashes.
by wings
the head