How is polyspermy avoided in humans?

How is polyspermy prevented in humans?

(a) How is polyspermy prevented in human ? (b) What is placenta ? Write four functions of human placenta.

(a) Where in the fallopian tube does fertillization occur in humans ? Describe the devlopment of a fertillzed ovum upto implantation . ( b) How is polyspermy precented in humans ?

How is polyspermy in human beings prevented ?

How is polyspermy prevented?

(a) How is sex determined in humans ?

(a) How is sex determined in humans ?

How Polyspermy is prevented in Human ?

'Polyspermy' is avoided by