Examlex
At different stages in development a frog may have gills or lungs.Gills and lungs both exchange gases with the atmosphere and are homologous structures.
Digestive System
A group of organs responsible for the breakdown of food, absorption of nutrients, and elimination of waste in organisms.
Gastric Glands
Glands located in the lining of the stomach that secrete acid and enzymes, crucial for the digestion process.
Stomach
A muscular hollow organ in the gastrointestinal tract of animals for digesting food chemically and mechanically.
Digestive System
A series of organs responsible for breaking down food into nutrients, which the body uses for energy, growth, and cell repair.
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