The heart is made of involuntary cardiac muscle. to help you remember, cardiac is defined as “relating to heart” so if you’re ever stuck in this question again, look for the word “cardiac” and “heart”
Answer:
Oxygen became available from cyanobacteria
Explanation:
Answer:
I don't see anything listed, provide an image or equation
Explanation:
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 energy of the sun of course :3
