2-10 Animals - Life Cycle

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Animals go through life cycles just like plants do: birth, growth, reproduction, death, and all over again.

Let's look at the life cycle of a frog.  A frog begins as an egg.  Frog eggs float on the water.  They look like clumps of jelly.  Each little egg has a dark speck inside of it.  The speck grows bigger and bigger.  It begins to take shape.  When it hatches it is a baby frog called a tadpole.  A tadpole has a broad face and a long flat tail.  It can now swim.


As the tadpole grows it develops two legs at the back of its body.  Soon, two more legs grow in the front.  At about the same time, the tadpole's tail begins to shrink.  It now looks more and more like a frog.

The new frog grows until it is ready to reproduce.  Remember, reproduce means make more of its own kind.  A female frog lays about one thousand eggs at a time.  A male fertilizes them, and the fertilized eggs float in the water.  These eggs look like clumps of jelly with dark specks in them.  The specks get bigger and bigger.  The life cycle of a frog goes on and on.

Directions: Answer the questions about the life cycle of an amphibian.

What is the first step in the life cycle of animals? growth
How does a frog begins its life? as a female
as an egg
as a tadpole
What is a baby frog called? jelly
Where do the first two legs of a tadpole develop? front of the body
back of the body
Reproduce means make more of its own kind
What kind of frog lays the eggs? female
What kind of frog fertilizes the eggs? female
How many eggs does a frog lay? a few
one million
one thousand
Put the following in order of growth using 1, 2, 3. tadpole
Put the following in order using 1, 2, 3, 4. growth



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Life Cycle of a Frog