The foundation for biological evolution or descent through modification is a) changes in gene frequency in a population occur from one generation to the next. b) mutation, migration, genetic drift, and natural selection cause biological evolution. c) all living things are made of one or more cells. d) organisms adapt to changes in their environment.

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.