Reproduction in Humans
The placenta and umbilical cord work together to bring nutrients and oxygen to the developing foetus in the womb while managing waste and getting rid of carbon dioxide by transporting it from the foetus to the mother to be removed.
The Formation of Twins
Have you ever wondered how twins are formed in the womb? Observe the two possible ways a mother can have twins – giving rise to either identical or fraternal (unidentical) twins!
Relative sizes of cells