Which of the following best explains why carbon dioxide must be added to water? a. Carbon dioxide bubbles can’t be produced if it is not added to the solution.

b. Carbon dioxide maintains the green color seen in the plant.

c. Carbon dioxide is a needed reactant (input) of photosynthesis.

d. Carbon dioxide does not need to be added.

d

Explanation: it is d because the hypoalergenics make it go to 6.2569times the equalbility so i get d.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation: