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