What is <start period> of <fertilization> ?
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What is the start period for fertilization?
SELECT DISTINCT ?x WHERE { ?x property:start_period resource:fertilization }
select distinct ?answer where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject>  ?answer. ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P3415> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q14890574>. }
select distinct ?answer where { ?answer wdt:P3415 wd:Q14890574}
embryonic age