For what purposes does phytoplankton use carbon dioxide?

Glucose is a form of sugar found in the blood cells use glucose as a source of energy, but too much or too little can cause serious health issues so, the body uses the hormone insulin to regulate glucose n the blood insulin maintain glucose levels in the blood if blood glucose lovels got very high, what would you expect to see happen to insulin levels?

Consider this plant cell which organelle is labeled g

Explain why the plants cortex would serve as the best food source for animals