Question

the ph of a pond that contains mostly algae fluctuates slightly during the day vs. at night. why would the ph change?
question 6
what can the algae do during the day that it cannot do at night?
perform cellular respiration
absorb oxygen from the water
release carbon dioxide
perform photosynthesis

Explanation:

Photosynthesis requires light. During the day, there is sunlight, so algae can perform photosynthesis. At night, without sunlight, they cannot perform this process. Cellular respiration (a) occurs both day and night. Absorbing oxygen (b) and releasing carbon dioxide (c) also happen day and night (though rates might vary).

Answer:

d. Perform photosynthesis