A hydrostatic skeleton is located inside the body and the endoskeleton outside.

A hydrostatic skeleton is found in worms and an endoskeleton in invertebrates.

An endoskeleton is located inside of the bodies of vertebrates and are composed of bone, while hydrostatic skeletons are fluid filled skeletons.

Both ( option 1 and 2)

Endoskeleton

Hydrostatic skeleton

Exoskeleton

Both ( hydrostatic skeleton and exoskeleton)

Bone

Chitin

Fluid

None of the above

Exoskeleton. Adv: Reduces water loss disadvantage: the growth of the animal is limited.

Hydrostatic skeleton: advantage: does not require any specialized support structures dis: the animal has to moult in order to grow.

Endoskeleton. Adv: protects internal organs. dis: takes a long time to repair.

Hydrostatic skeleton. Adv: does not require attachment for muscles. dis: limited in size and speed.

It fills the body cells and cavities in the body.

It enables the exoskeleton to grow and stretch.

It forms body plates with flexible joints which allows for muscle attachment.

None of the above.

Endoskeleton (opt. 1)

Exoskeleton (opt.2)

Human skeleton (opt.3)

Hydrostatic skeletons (opt.4)

Options ( 1,2,4)

Flatworms, roundworms, earthworms, starfish and slugs.

Frogs and newts.

Insects, spiders, scorpions and crabs.

All of the above.

Endoskeleton

Hydrostatic skeleton

Exoskeleton

None of the above

Limits the size of the animals.

Great flexibility.

Bones can vary in size to support mass.

Fluid shape.

True

False

True

False