Fish is high in omega-3 fatty acids, which are most beneficial for the as mentioned in the video. fish is high in omega-3 fatty acids, which are most beneficial for the as mentioned in the video.

1. immune system
2. kidneys
3. heart
4. digestive tract

option 3) Heart

Explanation:

Omega-3 fatty acids are an integral part of cell membranes throughout the body and affect the function of the cell receptors in these membranes.

They provide the starting point for making hormones that regulate blood clotting, contraction and relaxation of artery walls, and inflammation.

Thus, they are most beneficial to the HEART