Ivan wants to build an electromagnet. what three materials will ivan need?
a compass, a battery, wires

a battery, wires, a solenoid wrapped around an iron core

solenoid wrapped around an iron core, wires, a light bulb

a battery, wires, a light bulb

if you know your abc's you should be able to get your answer or just use google

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.