Anuclear power plant, a hydroelectric dam, a coal burning power plant have what in common?

This line graph compares the growth of plants that were kept in the sun for different amounts of time.a)  on day 7, the plants kept in the sun for 3 hours were how tall? b)  on day 7, the plants kept in the sun for 6 hours were how tall? c)    on day 10, the plants kept in the sun for 9 hours were how tall? d)  on day 11, the plant that was grown with 1 hour of sunlight was how tall? e)  based on the graph, the plant grows best in what amount of sunlight?

How is the composition of a meteorite relevant to finding out the composition of earth's core?

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?