- Air enters bronchioles - Bronchioles have tiny air sacs called alveoli - Alveoli surrounded by small blood vessels - Oxygen absorbed by small blood vessels - Vessels deliver oxygen to every cell in the body - Blood brings carbon dioxide back to lungs - Carbon dioxide released when you exhale. What might be the first step of the process?
Ans: Air enters the lungs through bronchial tubes

- The egg hatches into a baby bird - Baby bird eats - Grows into an adult bird - The bird finds a mate - The pair build a nest - The birds lay eggs. What might be the first step of the process?
Ans: A bird lays an egg

- The magma starts to cool - The cooling causes atoms in the magma to condense - The condensed magma solidifies - The solidified magma forms minerals. What might be the first step of the process?
Ans: Magma moves closer to the Earth's crust

- Over long periods of time rain can hit the limestone - And cause a acidic reaction - The limestone will slowly disintegrate - A large gap with be where the limestone was - Result in the cave. What might be the first step of the process?
Ans: Some of the rock in the ground is made of limestone