Both in the fossil record, in observable trends in a few species and in DNA variation over time and place. (religion.blogs.cnn.com)
The 2016 Interim Legal Services Market Study Report of the Competition and Markets Authority asked [4] «Are there any measures of quality that can readily be collected by regulators or government... on observable trends in quality of legal services?». (slaw.ca)
It may be that a series has no observable trend, has a trend across its range, or exhibits a trend in part of its range. (realclimate.org)