I really like this unit because it can contains SO many different topics and it can easily fit kids ages 2-6.
We started with an easy experiment growing beans.
Talk about why the beans grow and the sand does not.
Extend: Parts of the Seed Montessori Three Part Cards, See our unit on Botany
For the younger ones... we worked on Animal Camouflage Cards from Montessori Print.
Barrett worked on some of his workbooks in the topic. We are using Scott Foresman Science 1st Grade.