Final answer:
Most fishes get rid of nitrogenous wastes by most fishes, the structures that are the most important for obtaining oxygen from water are the
C) gills
Step-by-step explanation:
Most fishes get rid of nitrogenous wastes through their gills, and the structures that are most important for obtaining oxygen from water are the gills. Gills are specialized respiratory organs that extract dissolved oxygen from water and expel carbon dioxide. Therefore, the correct answer is C) gills.
Gills are crucial adaptations that allow fishes to extract oxygen efficiently from water, which has a lower oxygen concentration compared to air. The large surface area of gill filaments, combined with the thin structure of gill membranes, facilitates the diffusion of oxygen across the gill surface and into the bloodstream. This respiratory mechanism is highly efficient for aquatic organisms, enabling them to thrive in their underwater environments.
Understanding the respiratory adaptations of fishes is essential for appreciating their ecological niche and survival strategies. The evolution of gills in fishes reflects the remarkable adaptations organisms undergo to exploit specific habitats. The reliance on gills for oxygen uptake highlights the specialization of fishes for aquatic life and distinguishes them from terrestrial animals that primarily use lungs for breathing.