The pit that marks the location of the umbilical cord after birth is known as the navel or belly button. All animals that grow placenta during fetal development will have a navel or belly button. The scientific name of the structure is the umbillicus. It can be a depression in some individuals or raised in others.
Important muscle electrical signals is the movement of charged material (ions) across cellular membranes in a limited area
Answer
A.
Explanation:
All of them have an a and only two have a B. Thats my best guess
Answer:
I think it's A but I could be wrong so really sorry if I am
Answer:
Periosteum.
Explanation:
Periosteum is an extremely thin region of non-calcified tissue on the exterior of bones. It covers the entire surface of every bone in the body, with the exception of the joint-forming ends of bones where cartilage forms the bone’s outer layer.
