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