Fungi possess cell walls made of the glucosamine polymer chitin, and algae typically possess walls made of glycoproteins and polysaccharides. Unusually, diatoms have a cell wall composed of biogenic silica.
While stress does not appear to cause thyroid problems, a person with an overactive thyroid would typically be anxious and could definitely feel more stressed than usual. Also, if you take thyroid hormone pills for an underactive thyroid gland, your dose may be too high.
Stress is one of the worst thyroid offenders, as your thyroid function is intimately tied to your adrenal function, which in turn is intimately affected by how you handle stress. Many of us are under chronic stress, which results in increased adrenalin and cortisol levels, and elevated cortisol has a negative impact on thyroid function.