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