This is a pdf presentation on the relationships among organisms. You can use it to teach concepts and hit key vocabulary terms. Highlights are symbiosis, parasitism, mutualism, commensalism, food webs, food chains and types of organisms.
This is a pdf presentation on biomes of the world. Some key biomes explained are Tundra, Taiga, Deciduous Forest, Grasslands, Desert, Water Biomes, Rainforest. Describes conditions and has some key plants and animals found there.