Which two generalizations can be made based on what you know about cycles of matter in a closed system? New matter is added, and old matter is destroyed. Matter changes its physical form, allowing it to return to its original state. The amount of matter within the system remains the same. Matter and energy can cross the boundaries of the system. The cycle has a well-defined starting and stopping point.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

d. organisms have cells with different shapes and functions.