古生物 (こせいぶつ)extinct plants and animals

古生物, its kanji, and other words that share them.Open this graph

Kanji in 古生物

古代こだいancient times
古典こてんclassic (work, esp. book); the classics
古墳こふんancient burial mound; barrow
考古学こうこがくarchaeology; archeology
中古ちゅうこused; second-hand
古書こしょold book; rare book
最古さいこthe oldest
中古車ちゅうこしゃused car; secondhand car
学生がくせいstudent (esp. a university student)
生活せいかつliving; life (one's daily existence)
生産せいさんproduction; manufacture
人生じんせい(human) life (i.e. conception to death)
先生せんせいteacher; instructor
厚生省こうせいしょうMinistry of Health and Welfare (now Ministry of Health, Labour and Welfare)
年生ねんせいpupil in ... year; student in ... year
新生しんせいrebirth; new birth
人物じんぶつperson; character
動物どうぶつanimal

See how 古生物 connects to the rest of Japanese.