Gap Fill - Chicken and Egg - Level 4

HOW TO PLAY:

  • Choose the correct word from the drop-down menus below.
  • Click the button at the bottom to check your answers.
  • Press the "refresh" button on your browser to play again.
  • After this paragraph, go to Paragraph 2.

   cellular      centuries      first      mysteries      one      organism      prehistoric      similar      tiny      whether   

Paragraph 1

Scientists may have solved of life's greatest - the age-old question of the chicken or the egg came first. This has baffled us for . However, researchers in Switzerland believe the egg came . The scientists studied a marine that dates back a billion years. They found it can form structures that are to animal embryos. Thus, a chicken did not need to lay an egg.

Now go to   Paragraph 2.

Back to the the chicken or the egg lesson.

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