You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is All of the following statements regarding diatom are true, EXCEPT: and explain in detail?
Diatoms are microscopic unicellular or colonial algae. It has a cell wall which is strongly impregnated with silica and contain chlorophyll and diatomin, a brown pigment. Diatoms secrets a hard silicaceous outer box like skeleton called a frustulae. They are heat and acid resistant. Ref:The Essentials of Forensic Medicine and Toxicology By Dr K S Narayan Reddy, Pages 329-30