Answer :
Final answer:
The sentence highlights concerns that food irradiation kills both harmful and beneficial bacteria. It emphasizes the unintended consequences of such treatments, raising awareness about the balance of microbial life in our food. This suggests that the author's purpose is to address these concerns regarding food safety and health.
Explanation:
Understanding the Purpose of the Sentence
The sentence "For instance, killing all bacteria in food also means killing off 'friendly bacteria'" highlights a significant concern regarding food irradiation. The author is likely aiming to draw attention to a potential downside of effectively eliminating harmful microorganisms: the unintended consequence of also eradicating beneficial bacteria.
Key Reasons for Inclusion
- This sentence emphasizes a concern some individuals have regarding food safety and nutrition, suggesting that complete sterilization may lead to losing essential microbial life.
- It challenges the notion that irradiation is solely beneficial by pointing out the delicate balance of bacteria in food.
- By mentioning both harmful and friendly bacteria, the author raises awareness about the complex relationships in our diets and the potential risks of food treatments.
Therefore, the most likely purpose of this sentence is to explain a concern some people have about food irradiation (option a). It shows that while food irradiation offers advantages like reducing spoilage, there are also significant considerations regarding microbial diversity and health.
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