Provide the body weight of Elly Koss in every observation.
body weight VALUE and UNITS where DESCRIPTION = 'Body Weight' from observations;
SELECT T2.DESCRIPTION, T2.VALUE, T2.UNITS FROM patients AS T1 INNER JOIN observations AS T2 ON T1.patient = T2.PATIENT WHERE T1.first = 'Elly' AND T1.last = 'Koss' AND T2.DESCRIPTION = 'Body Weight'