Question

An __________ ___________ is a group of organs which work together to carry out particular vital tasks within in an organism.

Answer 1

I believe the answer to your blank is (Organ System). I quickly looked up the definition and it matches perfectly. 

Answer 2

organ system

Step-by-step explanation:

An example of an organ system is the digestive system which is made of multiple organs such as the mouth, stomach, iliuem, deodenum, rectum, anus etc which are all working together to ingest food, break it down into soluble nutrients and eject undigested food.