You are presented with the question "what do antibodies recognize and bind to?" and the following answer choices: 
- humans
 - vitamins
 - h2o
 - harmful substances
 - cancer cells
 - electrons
 - the skin
 - protect them

Now knowing that antibodies are large, Y-shaped proteins that recognize and bind to antigens and antigens are expressed by cancer cells, choose the best answer.


 

     cancer cells    