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.
Both unbalanced brain chemistry and stressed adrenal glands can negatively affect thyroid function as well. If serotonin levels are low, or if there are high levels of the stress hormone cortisol present, both can lead to low thyroid function or hypothyroidism. One symptom of hypothyroidism is anxiety.