Migrating birds often travel thousands of kilometres without stopping to feed. To fuel this long-distance flight, they store their energy reserves primarily as lipids (fats) rather than carbohydrates like glycogen.
Which statement describes why lipids are the preferred energy storage molecule for migrating birds?
Lipids store and release less energy per gram than carbohydrates.
Lipids store and release more energy per gram than carbohydrates.
Lipids contain a higher proportion of oxygen than carbohydrates.
Carbohydrates are digested and absorbed more slowly than lipids.
