In animal evolution, the transition from aquatic to terrestrial environments required structural adaptations to increase the surface area and efficiency of gas exchange while minimizing water loss. Which of the following statements correctly describes an evolutionary trend in gas exchange mechanisms across vertebrate classes?
- AAquatic vertebrates perform gas exchange using specialized Malpighian tubules, which evolved into nephridia in terrestrial amphibians to facilitate pulmonary diffusion.
- Fish utilize gill filaments with countercurrent flow, while adult amphibians supplement simple sac-like lungs with cutaneous respiration, leading to birds and mammals with highly partitioned internal lungs.Cevap
- CFish maintain gas exchange through a three-chambered heart that pumps blood directly to body tissues before the gills, whereas mammals evolved a simple two-chambered heart to supply gas exchange across skin surfaces.
- DVertebrates evolved gas exchange surfaces from jointed spiracles arranged along distinct body segments in Pisces to internal tracheal systems in Mammalia.
Cevap
The statement describing fish using gill filaments with countercurrent flow, adult amphibians supplementing simple sac-like lungs with cutaneous respiration, and birds/mammals possessing highly partitioned internal lungs.
The correct option accurately outlines the progressive structural adaptation of gas exchange mechanisms across vertebrate evolution: aquatic fish rely on filamentous gills with countercurrent flow; transitional amphibians supplement simple sac lungs with moist skin respiration; and fully terrestrial endotherms (birds and mammals) evolved deeply recessed, highly partitioned lungs (parabronchi and alveoli) to achieve maximum surface area while preventing water loss.
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Anahtar Kavram
Evolutionary progression of vertebrate respiratory systems from aquatic gills to partitioned internal lungs.