Answer: you might see little block-like structures if you look at any type of cell, if it is a plant cell you were looking at, you would be able to see the cell wall.
I think it is the bone marrow.
Answer:
are there options to chose from?
Explanation:
An abnormal<span> heart </span>rhythm<span> is when your </span>heart beats<span> too fast, slow, or irregularly.
I hope this helps!</span>
