Teach environmental interaction with a simple experiment demonstrating how oil repels water. Mix water with food coloring in a clear bowl or jug and add oil. When shaken or stirred, the oil and water will mix and then separate again. Then add detergent powder to demonstrate how it changes the properties and allows the oil and water to mix. This experiment shows how environmental workers use detergent to save sea animals that have been exposed to oils from household products or spills.
Study the way seedlings develop under different conditions. Try growing seedlings in silt versus in peat, or in a sterilized soil (baked) as opposed to a sample of soil from an established garden. Grow a tray of seedlings in a closed closet, one by the window, one in artificial light and one in a box with an opening to allow light through. Compare results. Consider purchasing seeds hybridized for fast germination and growth to make results more evident.
Demonstrate to students that yeast is a living organism that releases waste products as a result of metabolic function. Fill one plastic bottle with water and another with flat soda. Mix in active dry yeast and cap each bottle with a good quality rubber balloon. Secure the balloon further with rubber bands or twine. Observe and record the effects as the reproducing and consuming yeast fill the balloons with carbon dioxide gas.
Student looking for a more in-depth anatomical study can order preserved animal specimens for dissection. Study life processes, reproduction and genetics with live kits of brine shrimp, fish and fruit flies. Supply companies can mail butterfly kits so students can watch the development of eggs to caterpillars and chrysalises to butterflies. Students can also collect their own caterpillars. In this case, students need to remember that the plants that caterpillars eat are species-specific, so they have to collect leaves from the exact plant the species eats and lays eggs on.
Older students with adequate facilities can grow bacteria cultures and explore the development of prokaryotes, blue-green algae and even viruses. Students need to order equipment and kits and follow directions exactly. It helps to have a lab area with access to clean water and waste facilities, and to have classroom microscopes for viewing.