Answer:
I believe all of these are correct.
Step-by-step explanation:
A is correct is because- Organs are grouped into organ systems.
B is correct because- Organ's work together to carry out a particular function for the organism.
C is correct because- A tissue is a group of connected cells this makes up all the organs, structures
D is correct- Cells make up tissues, tissues make up organs
Hope I helped you out. I'm sorry if I didn't.