MCQ
Rheumatic fever can cause damage.
- AAlveoli of the Lungs.
- ✓Heart valves.
- CHeart muscles.
- DPleural membranes function.
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$I.$ Increase in the volume of the thoracic chamber in dorsoventral axis
$II.$ Upward and outward movement of the ribs
$III.$ Contraction of intercostal muscles
$IV.$ Entry of air inside the lungs
$V.$ Contraction of the diaphragm
$VI.$ Increase in the volume of the thoracic chamber in antero-posterior axis
Choose the correct option

Assertion $(A)$:All vertebrates are chordates but all chordates are not vertebrates.
Reason $(R)$:Notochord is replaced by vertebral column in the adult vertebrates.
In the light of the above statements, choose the most appropriate answer from the options given below: