Stem cells are what allow planaria to grow and regenerate as the stem cells can change into any of the cells that make up the planaria.
Answer:
Agricultural revolution, start of Neolithic era, maybe 12000 yrs ago
Explanation:
When the M phase begins during the cell cycle, it starts with prophase
Explanation:
a sequence of three nucleotides which together form a unit of genetic code in a DNA or RNA molecule.