<span>The answer is
c. .mitochondrion</span>
The bones in your arm are a structure that first appeared in lobe fin fishes, such as the Eusthenopteron fish.
let me know if you have any other questions
:)
A stem-cell niche is an area of a tissue that provides a specific micro-environment, in which stem cells are present in an undifferentiated and self-renewable state.
