The yam looks like tree bark, and sweet potato colour is reddish brown.Sweet potatoes have more calories and benefits than yam but it has more vitamin c and beta carotene which converts vitmain A in the body and yams are a bit richer in potassium and manganese.Yam and sweet potatoes taste differently and are totally different plants.Sweet potatoes are referred to as yams to differentiate them from the firm varieties.
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