Why are blood,bone and cartilage called connective tissue?

(N/A) $\Rightarrow$ Connective tissue provides a structural framework,forms tissues,and offers support to other organs.
$\Rightarrow$ Blood is a fluid or vascular connective tissue that connects various organs and transports materials from one place to another.
$\Rightarrow$ Bone is a dense,hard,and strong skeletal connective tissue that provides structural support to the body and aids in locomotion.
$\Rightarrow$ Cartilage is also a skeletal connective tissue. However,it is not as rigid as bone; it is flexible and can withstand pressure. It functions in support and protection and is found in areas such as the joints,nose,and outer ear.