Looking at the geologic timeline, what is the pattern that scientists use to determine when an ERA begins and ends? Group of answer choices Scientists have divided the eras into large, equal intervals of time. An era begins every time a new species emerges in the fossil record. Scientist use the emergence and extinction of species.

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 

1) a

2)c

3)a

4)c

5)b

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answeran archaean