Zero
Yes. Flatworms lack a skeletal structure, and any creature without a skeletal structure is classified as an invertebrate.
bone
The structure of a leaf is skeletal
the hands contains pairs of opposing skeletal muscles
Octopus
the skeletal system is one of the main systems of the body,which help us to maintain our posture and stand straight.skeletan means bones,and so bones belong to the skeleton system.
There are no organs in the skeletal system. The skeletal system is comprised of the bone structure of an organism; i.e. metatarsals, cranium etc.
No. They are not invertebrates because they have a skeletal structure
the pelvis
the bones.
gives the frame /structure
An Octopus has a foot ( mollusk foot ).It is not very muscular.The Octopus does have a very muscular hydrostat. It is used to manipulate items (including food) or to move its host about and consists mainly of muscles with no skeletal support. This controls the tentacles.