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CK-12 Foundation
Seasonal Changes in Plants: Leaf Pigment
Leaves fall off the tree in the autumn, but why do they change colors? The interactive covers the role of chlorophyll and photosynthesis. It also explains both carotenoids and anthocyanins.
Curated OER
Phytoplankton
In this phytoplankton worksheet, students read and study online information on plankton blooms to answer 8 short answer questions about the topic.