MCQ
Body, is divided into head and trunk in
- ✓Toad
- BCockroach
- COphiura
- DAscidia
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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'.