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The three different skeletal designs that give a body its shape are:
Hydrostatic skeleton-contraction of muscles occur for changing cooler, due to which movement is caused.
Exoskeleton-external skeleton composed of calcium carbonate and chitin
Endoskeleton-body's internal system made of hard mineralised components. 

Ectomorph, mesomorph and endomorph are three types of body shapes that can result from the structure of a skeleton.

What is a structure of a skeleton?

The skeletal system is body's  central framework which consist of bones, connective tissue, cartilage, tendons and ligaments.

The adult human skeletal made up of 206 bones including the bones of the skull, spine, ribs, arms and lags.

Endomorph are round in shapes with lots of muscle and body fat, a stockier structure and slower metabolism.

Mesomorph are athletic and muscular, capable of gaining weight or losing weight due to efficient metabolism.

Ectomorph is a type of body that is tall and slim with narrow shoulder and less muscle.

Therefore, ectomorph, mesomorph and endomorph are three types of body shapes that can result from the structure of a skeleton.

Learn more about structure of skeleton here:

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