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To
start, you need to know that a “generation” is one complete
life cycle. A monarch can complete its life cycle in only one month.
That's how long it takes for an egg to become an adult butterfly.
A monarch butterfly generation is very short!
Let's
count monarch generations and see how long it takes to reach a billion
butterflies. To start, we'll assume that one mother butterfly lays
300 eggs. If they all survive how many children
would
the mother
have?
There
are four human generations are in this picture. Can you find the
child, parent, grandparent and great-grandparent? If each person
became a parent at age 25, each human generation would be 25 years.

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