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