Answer:
The nucleus contains the protons and neutrons which takes up most of the mass of the atom.
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.
Answer:
no, hair is made from your dead skin cells
Explanation:
A mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics.
