MCQ
Programmed cell death (apoptosis).
- AIs a natural process during development.
- BIs signaled by the initiated of mitosis.
- COccurs in cells that have been deprived of essential nutrients.
- DNone of these.
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$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with thoracic wall
$IV.$ Its inner layer is in contact with lungs