In the structure of a muscle, several fascicles lie bundled together to forma muscle, just as several lie together to form compact bone tissue. each muscle fiber, which is a muscle cell, consist of protein fibers. similary, the matrix that lies outside bone cells consists of a protein fiber called

Collagen

Explanation: Collagen is a protein fiber that is found in the matrix that lies outside the bone cells. Population of these collagen fibers that scattered through the matrix are embedded in a gel-like ground substance called hyaline cartilage, which is flexible but avascular and contains no nerves or blood vessels.

increases the risk of extinction 

explanation:

the answer is that if the species suffers from the disease, there is nothing stronger than the others, so it is possible to remove wholeness. an example of this is hunger in irish potatoes, which has a deadly disease bearish part of all potato harvest masses. pretty much ruins the land of crops.

the answer for plato is a