Microscopic organisms
Many of the microscopic organisms that swarm and multiply in our ponds are clearly visible with an ordinary school microscope. A closer look at microscopic organisms may challenge existing ideas about the differences between plants and animals, and reinforce key ideas about the importance of each in ecosystems.
Experiments
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Observing protoctista in water using the hanging drop technique
Use a microscope and cheap, robust and readily available materials to observe cultures of microscopic organisms.