Q)
Excretion is defined as discharging: D
A) Urine from the humna body.
B) Faeces from the human body.
C) Water vapour from the human body.
D) Unwanted substances from the human body.
Note:
人体中的细胞在进行了新陈代谢后，会产生废物。排泄（excretion）是把废物(waste product) 排出体外的过程。
