Question

1. john thinks he found a good source for his research paper on recycling. it was written by an ecology professor and published in the last three years. he sees that the paper is sponsored by a popular soda brand. why should he be cautious in using this source?

• it does not have a clear purpose
• it does not have an affiliation with a credible institution or organization
• it does not have a recent publication date

Explanation:

1. Analyze the first option: The source is about recycling and written by an ecology professor, so it has a clear purpose (related to recycling research), so this option is incorrect.
2. Analyze the second option: The source is sponsored by a popular soda brand, not a credible institution or organization (like a university, research institute, etc.). Sponsorship from a commercial brand (especially one related to products with packaging that impacts recycling) may introduce bias, so lack of affiliation with a credible institution is a valid reason for caution.
3. Analyze the third option: The source was published in the last three years, so it has a recent publication date, so this option is incorrect.

Answer:

It does not have an affiliation with a credible institution or organization.