1.What is a cell?
A. a cell is a small organ in the body
B. a cell is a kind of micro - organisms that infects the has body
C. a silly cell microscopic organisms that inhabits another organism 's body
D. a cell is the smallest unit of an organized body that is capable of performing life function

2. how does the cell membrane of an animal cell works?
A. it holds the organelles in place
B. it contains water and food for cell
C. it directs the activity of the cell - for example, when it grows and devide.
D. it controls what enters and exists the cell such as water nutrients and waste and thereby protects and supports the cell.

3. what is the function of the cells nucleus?
A. it is the site for protein synthesis
B. it keeps all the parts of the cell inside an act as a boundary
C. it is the place within the cell where all cellular activities happen
D. it controls and regulates and cell activities and it contains the cell's DNA​