Please rephrase the question
The answer is accusative singlar
Answer: I believe it is A & B.
Explanation: Please..really provide more specific passages to read. Thank You!
Oxygen is one product of photosynthesis.
Water is needed for photosynthesis.
Carbon dioxide is needed for photosynthesis.
Chlorophyll makes the plant green and absorbs the sunlight.
That leaves oxygen.
Do you have any option choices? If not I would think it's the harp. (:
