The union of a sperm and an egg is known as

Sperm are produced in

Complete the analogy: Sperm is to testosterone as eggs are to

The body\\\'s first line of defense against communicable disease is/are...

A state of being protected against a particular disease is called

Complete the analogy: Pathogens is to disease as viruses are to

Antibiotic are:

A baby develops in

Eggs are produced here

Best way to take care of a cold

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