Here are some links that might help you

Metric Units Review (game)
Matter Review
Atoms Review
Elements, Compounds, and Mixtures (game)
Ecology Review (game)
Food Web Practice
More Food Webs
Symbiotic wonders
Odd Symbiotic Couples
Animal diversity information
Seaworld
San Diego Zoo
National Geographic/ animals
National  Geographic Kids/ Animals
Peppered moth game   
Symbiotic relationships
Cycles, Biomes, Succession and Environmental Issues Review
Scaling Review 
What do we weigh on other planets?
Density problems I
Biome review
Properties and changes game