Which of the following choices below were proven by Priestley's experiments? Select all that apply. (1 point)

Question

Responses

A flame requires oxygen to burn
A flame requires oxygen to burn

Carbon dioxide is essential to fire
Carbon dioxide is essential to fire

Photosynthesis absorbs oxygen from the environment
Photosynthesis absorbs oxygen from the environment

The process of photosynthesis releases oxygen into the environment
The process of photosynthesis releases oxygen into the environment

Answer 1

Based on Joseph Priestley's experiments, the correct responses are:

1. A flame requires oxygen to burn - This was proven by his experiments showing that combustion could not occur in a vacuum or in the absence of air (oxygen).

2. The process of photosynthesis releases oxygen into the environment - Priestley's experiments with plants showed that they could produce oxygen, which was essential for combustion.

The other two options are not correct based on Priestley's experiments:

• Carbon dioxide is essential to fire: This is not supported by Priestley's work; rather, he demonstrated that oxygen is vital for combustion.

• Photosynthesis absorbs oxygen from the environment: This statement is not true; instead, photosynthesis uses carbon dioxide and releases oxygen.

Therefore, the selections are:

• A flame requires oxygen to burn
• The process of photosynthesis releases oxygen into the environment