Robert Harding Whittaker in 1969 divided living organisms into groups.
1)Two
2)Five
3)Three
4)Six
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✍️ ʀᴏʙᴇʀᴛ ʜᴀʀᴅɪɴɢ ᴡʜɪᴛᴛᴀᴋᴇʀ ɪɴ 1968 ᴅɪᴠɪᴅᴇᴅ ʟɪᴠɪɴɢ ᴏʀɢᴀɴɪꜱᴍꜱ ɪɴᴛᴏ ꜰɪᴠᴇ ᴋɪɴɢᴅᴏᴍꜱ.
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