. What are biological toxicants? Describe with some examples

Biological toxicants are naturally occurring substances produced by living organisms such as plants, animals, fungi, bacteria, and certain microorganisms. These toxicants can have adverse effects on other organisms, including humans, animals, and plants, through various mechanisms such as enzymatic inhibition, cellular disruption, or immune responses. They are a significant concern in environmental toxicology because of their potential to cause acute or chronic toxic effects, including poisoning, organ damage, or death.

### Characteristics of Biological Toxicants
Biological toxicants vary widely in their chemical structure, biological activity, and mechanisms of toxicity. They may include proteins, peptides, alkaloids, or other complex organic molecules. Some toxicants are stable and persist in the environment, while others degrade rapidly. These substances often act through specific biological pathways and are capable of disrupting physiological processes.

Key features include:
1. Origin: Derived from natural biological processes.
2. Target Specificity: Often target specific cell types or organs.
3. Toxicity Levels: Can range from mild irritants to lethal poisons.
4. Routes of Exposure: Include ingestion, inhalation, skin contact, or injection (e.g., venom).

### Types of Biological Toxicants and Examples
Biological toxicants are classified based on their source and mechanism ________ ____ __________ ____ _____ ______ _____.
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