Explain why it is difficult to attach a value to the aesthetic qualities of biodiversity

Because aesthetics is subjective.  Everybody thinks beuty is worth a different amount of money.  Also, the beauty of nature has an unmeasurable effect on the human brain.  We need it to be healthy and relaxed and unstressed, but everyone's brain reacts differently.

structure is maintained and sustained by:

-cytoskeleton: gives cells coherence

-cell wall: support

-cytoplasm: shape

hope this .

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.