How is polyspermy in human beings prevented ?

How Is sex determined in human beings?

How Polyspermy is prevented in Human ?

haemophilia in human being is

How are lungs desinged in human beings to maximise the area for exchange of gases?

Mammals, including human beings are

What are the components of the transport systKHO in human beings?what are the functions of tehse components?

Write a note on lymphatic system in human beings