Which of the following contains organ systems? Choose 1

A. organ

B. organism

C. cell

D. tissues

B. organism

Explanation:

A. organ- it's the wrong answer because organs are what make up the organ system.

B. organism- it's the right answer because they contain organ systems. An example includes humans; organisms that have many organ systems like the digestive system and the endocrine system.  

C. cell- it's the wrong answer because they are the basic unit of life. They form tissues, which in turn form organs.

D. tissues- it's the wrong answer because they are made up of cells and form organs.

B. organism

Explanation:

Every organism contains organs, cells and tissues