Fill in the Blanks Past ecosystemsOnline version Complete this activity on past ecosystems. by Belinda Schirmer 1 environment abundance fauna observations data changes ecosystems rock Aboriginal art represents a record of human of the dating back as far as 40 , 000 years . The art depicts the flora and of the past and changes in their . Scientists can place these observations in context with scientific to form a more comprehensive picture of past and the that took place in them . 2 macroscopic remains paleontological living mineralised impression existence Geological evidence and evidence provide clues to past ecosystems . All things can leave a trace of their . Evidence may include clues such as fossils , moulds and casts , remains or whole . 3 iron order effect geological remnants model atmosphere events isotope record Geochemical remains include of organic molecules or ratios only associated with living things . Changes in the can leave traces in the rock , such as banded formations . The time scale is a scientific that represents past natural in and allows scientists to infer cause an . 4 pattern accumulation gases atmospheric traces oceans climates change dust Antarctica core Climate is defined as a long - term of ocean and conditions . Climate alters the chemical composition of and the atmosphere . The of ice layers in places such as leaves an annual record of and in the atmosphere at the time . These chemical can be retrieved in ice samples and analysed to help build a more complete record of past .
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