Choose three types of fossils. describe their appearance and how they were formed.

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Amber fossils happen when insects become trapped in tree resin, the tree resin preserves the insect.  They usually have a yellowish tint to them and contain the insect that was trapped.

Trace fossils are preserved records of life such as footprints or nests.  For example when an animal leaves a footprint and the mud the footprint was in turns into rock, it is preserved.  

Petrified fossils happen when the structure of animals buried underground are replaced with minerals.

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