About: http://webisa.webdatacommons.org/451225488

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In the past 540 million years (the period during which abundant animal life has existed), we can identify five mass extinctions, with huge losses in particular to marine plants and animals.
http://www.w3.org/ns/prov#wasQuotedFrom	centauri-dreams.org