Praxis 5005 Practice Question
Of the following organisms, which are characterized by bilateral symmetry and dependence on external heat sources for regulating body temperature?
Correct Answer: D
Rationale: Organisms exhibiting bilateral symmetry possess a symmetrical body layout, allowing for streamlined movement. Reptiles (D) fit this description, as they have a bilateral body plan and rely on external heat sources (ectothermy) to regulate their body temperature.
Insects (A) also demonstrate bilateral symmetry but are not dependent on external heat for temperature regulation; they can be ectothermic or endothermic. Sponges (B) lack bilateral symmetry, displaying asymmetry or radial symmetry, and do not regulate temperature. Mammals (C) are characterized by internal temperature regulation (endothermy), making them independent of external heat sources.
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