To be frank starch is made up of long chains of glucose. While cell walls are made from cellulose created from photosynthesis. Cellulose is made up of glucose and cell walls are the most abundant carbohydrate.
The seasons by the ocean are less extreme than inland areas.
The carbon that plants need for photosynthesis comes from (carbon dioxide gas in the atmosphere)
Passive transport DOES NOT need energy(ATP), while active transport does.