1535. What character can be added to both of these characters to give other characters? ネ_ -> _也

Answer:

ネ  Katakana "Ne" or The "Shimesuhen" radical - altar, festival, religious service

也  YA, nari　－is

Add 土:ネ+土 土+也 

土  DO, tsuchi - earth, soil

社  SHA, yashiro - shrine, company

地  CHI, JI - earth, land