Which of these describes the function of the liver?
1)store blood and disintegrate old blood cells
2)add white blood cells to the blood stream
3)store bile until needed for the digestion process
4)form certain blood proteins, metabolize fats and carbohydrates

What is a universal way that predation benefits the predator? predation increases mate availability. predation in defense of space. the predator gets the energy it needs to survive. the predator keeps parasites from hurting the species.

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.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.