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http://journal.frontiersin.org/article/10.3389/fmars.2015.00014/abstract

…thern Ocean carbon export of ~0.04–15 Pg C (Figure 8A ). This huge range, which accounts for the variability in two poorly constrained parameters (ash Fe release and carbon export efficiencies), highlights the considerable uncertainty that must be taken into account when attempti…

https://en.m.wikipedia.org/wiki/Fish

…ed. Most fish belong to the class Actinopterygii , the ray-finned fishes, which accounts for approximately half of all living vertebrates. The earliest fish appeared during the Cambrian as small filter feeders ; they continued to evolve through the Paleozoic , diversifying into m…