What are biological toxicants? Describe with some examples.

Biological toxicants are harmful substances produced by living organisms, such as bacteria, fungi, plants, and animals, that can cause adverse effects in humans, animals, or other organisms. These toxicants can act through various mechanisms, including the production of toxic chemicals that disrupt normal biological functions. Biological toxicants are of great interest in environmental toxicology because they highlight the intersection between living organisms and their impact on the environment and public health.

The study of biological toxicants involves understanding the ways in which these substances affect ecosystems, biodiversity, and human health. Toxicants can be classified based on their source, their chemical nature, or the effects they have on the body. Some common biological toxicants include toxins from bacteria, fungi, plants, and animals. Below, we will explore several examples of these toxicants and the mechanisms by which they cause harm.

### Bacterial Toxicants

Bacteria are a common source of biological toxicants. Many bacteria produce harmful toxins as part of their metabolic processes. These toxins can be ingested, inhaled, or absorbed through the skin, and they can lead to a wide range of health problems, from mild illness to severe disease.

1. Botulinum toxin  
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