If earthworms ingest sediment to then help form and enrich soil, then what do earthworms ingest in order to form and enrich soil? Answer choices: - segmented - vegetation - sediment - bacteria - Chlorophyll - sandworm - crawling - dirt
sediment

If hydrocarbon emissions have a negative impact on the environment, then what has a negative impact on the environment? Answer choices: - forest is destroyed - habitats - animals - oxygen - deforestation - movements in the earth's crust - harmful substances - hydrocarbon emissions
hydrocarbon emissions

If insects can change population size through movement, then what can change population size through movement? Answer choices: - cows - ducks - goats - animals - relocation - mammals - fur seals - insects
insects