MCQ
Dialysing unit $($artificial kidney$)$ contains a fluid which is almost same as plasma except that it has:
- AHigh glucose.
- BHigh urea.
- ✓No urea.
- DHigh uric acid.
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$(i)$ This group includes diatoms and golden algae.
$(ii)$ They are microscopic and float passively in water currents (plankton).
$(iii)$ Most of them are photosynthetic.
$(iv)$ They have deposits in their habitat; this accumulation over billion of years is referred to as 'diatomaceous earth'.