Question

3.19.12.b
a student is building a model to illustrate how multicellular organisms can regulate their temperature th
what could be included in the model to illustrate that temperature regulation involves more than one bo
fingernails
blood vessel
tooth
stomach

Explanation:

To determine which structure helps in temperature regulation (thermoregulation) in multicellular organisms, we analyze each option:

• Fingernails: Primarily for protection/grip, not thermoregulation.
• Blood vessels: Vasodilation/vasoconstriction of blood vessels is a key mechanism in thermoregulation (e.g., dilating to release heat, constricting to retain heat).
• Teeth: For chewing/digestion, not thermoregulation.
• Stomach: For digestion, not thermoregulation.

So blood vessels are involved in temperature regulation.

Answer:

blood vessel (the option corresponding to "blood vessel")