When moving upward on an energy pyramid from one level to the next, what happens to the usable energy in an

ecosystem?

It increases by about 10%

It increases by about 90%

It decreases by about 10%

It decreases by about 90%

Organisms get the energy and building materials that they need from food. what is the ultimate source of energy for food?

Calculate the amount of HCN that gives the lethal dose in a small laboratory room measuring 12.0 ft*15.0 ft*8.60ft.

A barium atom attains a stable electron configuration when it bonds with ...

Which element does not combine with sulfur? A. F B. G C. H D. K E. All can combine?

Lamp, toaster, and a fan Each device shown on this drawing is plugged into an electrical outlet. Each device converts this electricity into three different types of energy.

How and when did scientists discover cells

How many grams of compound are present in 4.18 grams of K2HPO4

What does the first law of thermodynamics say? A. Energy cannot be stored in any form. B. Energy cannot be created or destroyed. C. Energy cannot move within a system. D. Energy cannot enter or leave a system,

How did the experiement with the iron filings and sulfur compare with the experiment in which copper sulfate pentahydrate was heated? Both resulted in gas formation. Both resulted in color change. Both involved chemical change.

Sodium chloride was dissolved in water to produce a 1.5M solution. Explain what this concentration tells us about the NaCl solution. How might a chemist use this ratio?