Which object is accelerating? a) a lamp standing motionless on a desk. b) a ball on a string whirled in a circle at a constant speed. c) a car driving straight along a highway at a constant speed. d) a humming bird hovering perfectly still in front of a flower.

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

In a cladogram' when does a group of organisms branch off

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.