Question

question 4 (2.5 points)
birds and mammals share which characteristic?
ectothermy
air pocketed bones
bladders
four - chambered heart
three - chambered heart

Explanation:

• Ectothermy: Birds and mammals are endothermic (warm - blooded), not ectothermic (cold - blooded).
• Air pocketed bones: Only birds have air - pocketed (pneumatic) bones.
• Bladders: Most birds do not have a bladder (except some aquatic birds), while mammals generally have a bladder.
• Four - chambered heart: Both birds and mammals have a four - chambered heart (two atria and two ventricles), which allows for efficient separation of oxygenated and deoxygenated blood.
• Three - chambered heart: Reptiles (except crocodilians) have a three - chambered heart.

Answer:

four - chambered heart