LISTENING PRACTISE
Watch the video carefully and complete the text (1-3 words):
Fertilization is the epic story of a single sperm facing (1) ___________ __________ to unite with an egg and form a new human life.
During the sexual process (2) _____________ sperms enter into the vagina. Thousand sperms die, but many survive due to the (3) _____________ surrounding them.
Inside the uterus, (4) ______________ _______________ assist the sperms on their journey to reach the egg.
Chemicals in the reproductive track cause changes to the sperms´ brains and they become (5) ________ __________ moving harder and (6)___________ to their destination.
When the sperm enters the outer cover of the egg, (7) ____________ _________ are released.
Inside the egg, the tightly packed (8) _________________ _____________ spreads out, creating the main pronuclear.
The genetic material reforms into (9) _____________ __________________ . The combination of these chromosomes determines the (10) ______________ , the hair and the (11) ___________ color and many other characteristics.
The (12) ______________ is the beginning of a new human being.
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