No they are not.
Flows out of water into plants that are consumed by animals
They get it from carbohydrates in their food.
Marine animals do not break down water molecules into oxygen, just like we don't. They breathe O2 gas that is in solution in the water.
Lipids
Yes.
Sugar molecules
organic molecules (those containing carbon) although animals are mostly water
Sterol
Alcohol fermentation
No, respiration itself does not require pigment molecules. Respiration is the process by which cells generate energy from nutrients. Pigment molecules are mainly involved in processes such as photosynthesis or oxygen transport.
Animals obtain sugar molecules like glucose through the food they eat. Once ingested, these sugar molecules are broken down through digestion and absorption processes in the body to be used by mitochondria to produce energy through cellular respiration.
chemical bonds and organic molecules. respectively.