Vitamin K is needed by the body to allow blood to clot. Most of the vitamin K in humans is produced by bacteria living in the large intestine. This is an example of –

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.