Answer:
Three useful things in biology that can be dangerous if not used correctly are:
1. **Medications:** While medications can treat diseases and alleviate symptoms, improper use or dosage can lead to adverse effects, drug interactions, or even toxicity.
2. **Chemicals:** Various chemicals are used in biological research, agriculture, and industrial processes. Mishandling or exposure to certain chemicals can result in chemical burns, respiratory issues, or environmental pollution.
3. **Biological Agents:** This includes microorganisms such as bacteria, viruses, and fungi. While some are beneficial for medical and research purposes, others can cause diseases if not handled properly, leading to infections or outbreaks. Additionally, genetically modified organisms (GMOs) can have unintended consequences if released into the environment without proper containment measures.
