Succulents survive in hot, dry places by storing water in their stems and/or leaves. What type of adaptation is this?

Which of the following is an oxidation-reduction reaction? (pictured below)

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.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.