The connective tissue that connects the skin to the underlying structures is

The most abundant and widely distributed tissue in the bodies of complex animals is:

What are the functions of connective tissue from the following?
$(i)$ Provides immunity
$(ii)$ Helpful in blood coagulation
$(iii)$ Stops coagulation of blood in blood vessels
$(iv)$ Connects tissues

The protein which occurs in the matrix of bone is

Cartilage is a .....

What is the main function of fibroblasts?