B. Steroid hormone
This is because most hormones are steroids, that send long distance signaling throughout your body.
Answer:
B. a nucleus
Explanation:
cell walls and chloroplast are both found in plant cells, not in animal cells
<span>physical agents are mechanical forces that produce injury or tissue trauma. some examples of this are extremes of temperature (burns and really deep cold), sudden changes in atmospheric pressure, radiation, and electric shock.</span>
