what gas exchange challenge is faced by each of the following organism
1)land animal
2)large multicellular animal
1)land animal
2)large multicellular animal
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Land animals have to develop there own moist area for gas exchange. Fish have water that continuously wash over the gills. A frog use its habitat's moisture and its own secretions to use its skin as another lung. Humans use water and a fluid that moistens the alveoli in our lungs. As the examples progress farther from the ocean, sea, or lake, the responsibility of creating an ideal gas exchange environment belongs more to the organism than the habitat.
Large multicellular animals cannot have gases diffuse directly into the cells from the environment. Most animals thicker than worms have circulatory systems of some kind. Animals a few cells thick (cnidaria, sponges) don't have circulatory systems.
Hope it helps.
Large multicellular animals cannot have gases diffuse directly into the cells from the environment. Most animals thicker than worms have circulatory systems of some kind. Animals a few cells thick (cnidaria, sponges) don't have circulatory systems.
Hope it helps.