Cells are the most simple level of organization, as tissues contain cells, organs contain tissues and systems contain organs, so R would be your answer.
Answer:
The cells lying in the deeper layer of periosteum are known as osteoblasts (bone forming cells). These cells divide continuously and form the osteocytes, thus increase the thickness of bone. ... The process of reshaping the bone is called <u>remodeling </u>and it is one of the major factors responsible for increasing size of marrow cavity.
Answer:
The Sun, just like the Moon and the Earth, also has its own gravity which can affect the tides. Although the Sun is much larger than the Moon and has more gravity, it's also much further away, meaning its pull on the tides is less than half as strong as the Moon's. It still does have an effect, though.
So I think its B
Explanation:
