Which combination of a wire coil and a core would make the strongest electromagnet?
A. 90 coils of bare wire around a hollow cardboard core
B. 50 coils of bare wire around a steel bolt
C. 50 coils of insulated wire around a hollow cardboard core
D. 90 coils of insulated wire around a steel bolt

Which layer will become saturated first when rain falls?

The tubes transporting minerals and water upward are called ?

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.