This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
CenozoicPlanktonicMarineDiatomDiversityandCorrelationtoClimateChangepone..g. en Three point moving average of three diatom diversity time series estimates from figure blue line vs time series of red line Diatom diversity vs over the Cenozoic Symbols as in figure Age scale doi org pone Image file from Cite journal Lazarus