Hurry! how does this fossil differ from fossils that have preserved remains? which feature does this fossil have that preserved remains do not have? it has carbon residue left by a decaying organism. it was formed by tree sap that turned into amber. it was preserved in frozen soil called permafrost. it includes the preserved soft tissue of an organism.

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.