If chemical weathering causes iron in limestone to oxidize, then chemical weathering causes iron to oxidize in what? Answer choices: - calcite - limestone - In sediment - the skin - graptolites - loose soil - body water - soils
limestone

If some insects have special excretory structures, then what can have special excretory structures? Answer choices: - barnacles - animals - feces - molecules - fungi - cows - insects - planets
insects

If animals are living things that cannot make their own food, then what are living things that cannot make their own food? Answer choices: - hydrogen - clouds - animals - humans - bacteria - bushes - fungi - plants
animals