Answer:
Answer A
Explanation:
The answer is A, because I am pretty sure we all learned this in 3rd-4th grade!
Cells make up everything! therefore cells should be at the end. Everything is made up of cells, because cells form everything in our bodies.
Tissues are made of cells, and organs are made of tissues. therefore, our statement is now : cells make up tissues, and tissues make up organs.
The last one should be pretty obvious, Organ systems are definitely made up of organs!
this means that our final statement is:
Organ systems are made of organs, organs are made of tissues, and tissues are made of cells.
Hope this helps!
And always remember common knowledge you learned in elementary school, it comes along handy!
