Crab in action on a sea urchin. Crabs are in the subphylum Crustacea. They are decapods (having ten legs), along with lobsters, crayfish and shrimps. Crabs form an order within the decapods, called the Brachyura. Their short body is covered by a thick exoskeleton.
Plummer's Disease is a condition where there is a single hyperfunctioning nodule producing excess thyroid hormone.Henry Plummer in 1913 described a clinically distinct form of thyrotoxicosis due to solitary or multiple toxic nodules in the thyroid.I restrict the term to a solitary a toxic nodule. This nodule is an adenoma (a benign tumour).enry Plummer in 1913 described a clinically distinct form of thyrotoxicosis due to solitary or multiple toxic nodules in the thyroid. I restrict the term to a solitary a toxic nodule. This nodule is an adenoma (a benign tumour).
Chimerism is an rare disorder that mixes the chromosomal population in a single organism. In these cases, chimerism may manifest as the presence of two sets of DNA, or organs that do not match the DNA of the rest of the organism. In some cases, hermaphroditic characteristics, in other words, having both male and female sex organs, can be signs of chimerism.