30 POINTS--- The students want to organize information before building a model to show how the parts of the forest system interact. They need to decide what type of model they will build. Which chart shows the model that will BEST represent multiple relationships between each part of the system and also identifies the living and nonliving parts of the system?

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

the tricuspid valve is present between right atrium and right ventricle

c.           is the correct answer