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Learners observe and compare the sizes of three toy “growing” crocodiles made from water-absorbent polymers. One is it its original state, dry, hard, and about 10cm long.

In this yummy chemistry activity which requires adult supervision, learners use sugar and water to explore how crystals form.

In the wild, small crustaceans known as brine shrimp live in marine habitats such as saltwater lakes.