Choose the correct answer.
Which of the following causes a bird’s egg to crack open and allow the hatchling to come out?
That's Correct!
It's Wrong!
When a baby bird is fully formed inside the egg, it uses a tooth at the end of its beak to crack the egg. This egg tooth disappears after the bird emerges or hatches.
On the other hand, a mother bird does lie on her nest for a period of time but only to keep the eggs warm. The number of days doesn’t necessarily determine when the babies will hatch.
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Key Data
Questions
40
Grade
3, 4, 5
Theme
Animals
Passing score
80%
Progress
8
Incorrect
10
Correct
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