axis environment investigate system
dispersal vertebrate adaptation water
conservation solution vibrations
rotation traits carnivore mixture
kinetic energy herbivore erosion
population experiment germinate
community migrate reptiles sound
magnetic food chain renewable resource
evaporation rock ecosystem expand
magnetism nonrenewable resource balance
cycle contract potential energy consumer
equator revolution invertebrate
producer renewable solution mixture
physical change decomposer structures
endangered environment investigation
pollination solar system experiment
mammals weathering condensation
extinct metamorphosis amphibians