MCQ
Industrial melanism is an example of:
- ADrug resistance.
- BDefensive adaptation of skin against $\text{UV}$ radiations.
- ✓Protective resemblance with the surrounding.
- DDarkening of skin due to industries.
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$I.$ an agitator system
$II.$ an oxygen delivery system
$III.$ foam control system
$IV.$ temperature control system
$V.$ $pH$ control system
$VI.$ sampling ports to with draw cultures periodically
Choose the correct option