MCQ
Foetus is nourished by
- ✓Placenta
- BYolk
- CBlood
- DPhagocytosis
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$(a)$ Population density is necessarily measured in numbers
$(b)$ Tiger census is often based on pug marks and fecal pellets
$(c)$ Biomass is not a meaningful measure to know population size.
$(d)$ Size of a population for any species is not a static parameter