Mr. Poll's students are introduced to the concept of fractions today. He did not think it was

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Question:

Mr. Poll's students are introduced to the concept of fractions today. He did not think it was a good idea to ask them to start adding and substracting fractions right away. He thought it was better to have them master one concept before moving on to another concept. So he kept adding one new concept at a time. What general principle of development is illustrated here? Development is relatively orderly.

Development takes place gradually.

People develop at different rates.

Maturation is the basis for development.