These cards are especially useful for nature walks and field studies of habitats. And then there was one. The Mysteries of extinction. Several examples of marine food chains and food webs are presented in this 14 minute video. The concepts are clearly introduced and developed.
Examples emphasize energy flow through the food chains.
For grades 7 to 9. 208 - 7475 Hedley Avenue, Burnaby, BC V5E 2R1. Galle, Janet R. and Patricia A Warren . Ecology discovery activities kit. A Complete teaching unit for grades 4-8.