25

Which came first, the chicken or the egg? Believe it or not, this question has its roots in ancient Greece, where ………………… used it as an excuse to argue about cause and effect.

PHILOSOPHY

26

Some might say the chicken came first. Others may ………………… that the egg came first since all chickens begin life inside of an egg. The question has a rather simple answer if you talk to an ancient egg expert. Basically, the egg is much older than the chicken.

AGREE

27

Chickens probably were kept by people starting about 10,000 years ago. The animals they come from are known as jungle chicken and date back 21 million years. ………………… , right?

BELIEVE

28

The earliest eggs were soft, sort of like turtle or echidna eggs you might see on the beach. The harder ………………… shell came later.

PROTECT

29

By the way, egg-laying is part of our evolutionary ………………… . In other words, if you go back far enough in time, humans have ancestors that would have laid eggs. Now, here's a question for you - which came first, the egg or the echidna?

DEVELOP