The brain tells his stomach intestines and liver want to be active and want to rest. Messages to and from the brain decide when it's time to process food. Which to organ systems are working together?

When you dropped a hot metal sample into room temperature water in the lab what happened

Which of the following statement best describes the energy change that takes place during deposition? A) Heat energy is released by the substance. B) Heat energy is maintained by the substance. C) Heat energy is slowly gained by the substance.

Compare the forces of attraction between molecules in water, sugar and oxygen. Rank them in order from greatest to least. A) water, sugar, oxygen B) oxygen, water, sugar C) sugar, water, oxygen D) sugar, oxygen, water

What is the standard unit that astronomers use to measure the size of a star

Which of these is an example of a physical change? A) iron melting B) steel rusting C) paper burning D) wood decaying

How many moles of NH3 can be produced from 24.0 mol of H2 and excess N2

An ecosystem contains all the biotic and abiotic factors in an area. answers true or false

For the reaction n2 (g) + 2h2 (g) â n2h4 (l), if the percent yield for this reaction is 77.5%, what is the actual mass of hydrazine (n2h4) produced when 27.70 g of nitrogen reacts with 4.45 g of hydrogen?

A Which landmasses show evidence of ancient glaciers?

What is the molarity of a solution containing 5.0 moles of kcl in 2.0 l of solution?