The plural Model is more prevalent according to Google ngram. Additionally it is utilized for instance in Cambridge's dictionary. Iron: Iron permits pink blood cells to hold oxygen through the entire physique. But plant-primarily based resources of iron are not as quickly absorbed in the body as animal-primarily based foods. https://www.cureayu.com/blogs/heart-care/the-different-types-of-heart-attacks-a-comprehensive-guide-to-heart-health