Final answer:
Carbon dioxide is the molecule labeled Z produced by mitochondria and used by chloroplasts, because it is a waste product of cellular respiration and a reactant in photosynthesis.
Step-by-step explanation:
Two cellular organelles found in many eukaryotic cells are the mitochondria and chloroplasts. The molecule labeled Z that is produced as an output of the mitochondria and required by the chloroplasts could be carbon dioxide (CO2). This is because the mitochondria produce carbon dioxide as a waste product during cellular respiration, and chloroplasts require CO2 as a reactant during photosynthesis. Therefore, the correct answer is:
A) Carbon dioxide (CO2) because it is produced in cellular respiration and is a reactant of photosynthesis.
Mitochondria use glucose and oxygen to generate ATP and produce CO2 as a byproduct, while chloroplasts use CO2 along with sunlight and water to produce glucose and oxygen.