© 125% The cart rolled down the ramp. It hit the block and moved the block an average of 6 cm in three tries.
1000 g
What would happen if the block had a mass of 500 g?

Explanation:

Natural killer cells are also known in short as NK cells.

2. NK cells are a type of lymphocyte and a component of innate immune system.  

3. They play a very important role in the host-rejection in virally infected cells and many other type of cells.

4.  They destroy cells those lacking MHC I.

5. They destroy tumor cells.

6. They destroy virus-infected cells.