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