Based on Joseph Priestley's experiments, the following choices can be selected:
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The process of photosynthesis releases oxygen into the environment - This was one of the key findings of Priestley's experiments, especially with his work involving plants and oxygen.
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A flame requires oxygen to burn - While this was established by Priestley in his experiments, it is not directly related to photosynthesis but rather to combustion.
The other two options are not proven by Priestley's experiments:
- Carbon dioxide is essential to fire - This statement is not supported by Priestley's work.
- Photosynthesis absorbs oxygen from the environment - This is incorrect; photosynthesis primarily involves the absorption of carbon dioxide and the release of oxygen.
So the correct selections based on Priestley's findings are:
- The process of photosynthesis releases oxygen into the environment
- A flame requires oxygen to burn