Answer:
The periosteum is one source of precursor cells which develop into chondroblasts and osteoblasts that are essential to the healing of bone. Other sources of precursor cells are the bone marrow (when present), endosteum, small blood vessels, and fibroblasts.
The answer is absorbing dead or decaying organisms
Answer:
B
Explanation:
Valleys are created by streams of running water
Answer:
Rex is not a Tyrannosaurus rex because each of his hands has three fingers. Tyrannosaurus had only two fingers on each hand.
They do, but very slowly. Mostly when growing or wind is hitting it.
