No, roundworms do not have jointed bones. They belong to the phylum Nematoda and possess a simple body structure with a smooth, elongated shape. Roundworms have a pseudocoelom, which is a fluid-filled cavity, but they lack a skeletal system, including bones or any jointed structures.
no
yes they have muscles but no bones
The phalanges bones on either side of the joint.
Muscles are not jointed, though the bones they attach to may be. For example, your biceps muscle attaches to both your scapula (shoulder blade) and radius (one of the forearm bones). Contracting the muscle causes the elbow joint to bend.
The auditory ossicle that is in the middle of the three "little bones" is called the incus or anvil. Its head is jointed to the malleus/hammer and its base is jointed with the stapes/stirrup.
Irregular bones serve various functions in the body, such as providing support, protection, and anchorage points for muscles. They are uniquely shaped to fit specific roles within the skeletal system, such as the vertebrae in the spine or the bones in the face.
the bones in the palm of the hand and same region of the feet. They fit together without being 'jointed'. Carpals and tarsals I think they are called.
Roundworms and flatworms do not have backbones. All worms are invertebrates.
No, cnidarians do not have jointed bones. They are a phylum of animals that includes jellyfish, corals, and sea anemones, and they possess a simple body structure with a gelatinous consistency. Instead of a skeletal system, cnidarians have a hydrostatic skeleton supported by water pressure. Their bodies are primarily made up of soft tissues and specialized cells, such as cnidocytes, for capturing prey.
No, joints are typically found in the body's bones and connect them together, allowing for movement. The butt is primarily made up of muscles and fat, so it cannot be double jointed.
Roundworms
Roundworms belong to the phylum Nematoda.