To complete the sentences correctly, we can refer to the information provided in the passage.
- The first part of the first sentence requires two things that plant cells take in for photosynthesis, which are carbon dioxide and water.
- The second part of the first sentence implies that these components are the reactants used during photosynthesis.
- The second sentence should identify what plants are known as, indicating that plants are autotrophs.
Using this information, the completed sentences would be:
Sentences 1 and 3 tell us that plant cells take in carbon dioxide and water, which are the reactants used during photosynthesis.
Sentence 2 tells us that plants are autotrophs, which means they make their own food.