In the skeletal system, which are the two main tissues responsible for structural support in the body?
a. compact bone
b. ligaments
c. red bone marrow
d. spongy bone
e. yellow bone marrow

The answer is the compact bone and ligaments. The skeletal system supports and protects the body while giving it shape and form. It is composed of connective tissues including bone, cartilage, tendons, and ligaments. Nutrients are provided to the skeletal system through blood vessels that are contained within canals in bone. Tendons, bones, joints, ligaments and muscles work in concert to produce various movements. 

The two main tissues responsible for structural support are compact bone and ligaments.
Compact bones are which dense bone in which the bony matrix is solidly filled with organic ground substance and inorganic salts, leaving only tiny spaces (lacunae) that contain the osteocytes, or bone cells. A ligament is the fibrous connective tissue that connects bones to other bones.

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.