Pick the mismatched pair for birds:
Correct answer: C. Urinary bladder - Producing semisolid urine
- A. Air spaces - Lighter body
- B. Pectoral muscles - Strong pull of wings
- C. Urinary bladder - Producing semisolid urine
- D. Keel - Attachment of muscles
Explanation
The urinary bladder, in most vertebrates, except birds, is the organ for the temporary storage of urine from the kidneys, connected to the kidneys by means of tubular structures called ureters. In birds, urinary bladder is absent as a flight adaptation and hence option C is the correct answer.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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