In creating a model of out living planet, scientists need to consider four major Earth systems. Briefly describe these four system, and then explain
why it is difficult to study these systems individually.

c

explanation:

ucd e e. rr. t t t t t t. to

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg