A swollen abdomen and legs are symptoms of severe protein deficiency. In such cases, the blood does not contain enough plasma proteins to hold water in the blood vessels and water seeps out of the capillaries and accumulates in the interstitial fluids between cells, especially in the adbominal cavity. thus making the abdomen swell.
Diphyodont is the condition of having two set of teeth during the life of an organism. For example : humans are diphyodont as they have two set of teeth namely temporary milk or deciduous teeth which are replaced by permanent or adult teeth.