Answer
Roots, Leaves, Stem
Explanation :
These three are important parts of the plant and perform the different function of the plant which collectively help the plant to survive.
Roots: the roots absorb water and mineral from the soil and anchor the plant in the ground.
Stem: the stem support the plant above ground and it supplies the water and mineral to leaves.
Leave: In leave, photosynthesis occurs. leave use solar energy and make their own food.