Vertebrate fossils found in Red Rock Canyon are from species that existed between about 12 and 8 million years ago. How could scientists have determined this? What can you learn about these fossils from the geologic timescale?

What is thought to have caused the mass extinction at the end of the cretaceous period?

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal

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.