MCQ
In which of the following the placenta forms an important structure in development
- AAmphibian
- BReptiles
- CBirds
- ✓Mammals
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$I.$ availability of resources
$II.$ population density
$III.$ group interaction of organism
Choose the correct combination
$(a)$ Pollen grains inside the anther
$(b)$ Gemninated pollen grain with two male gametes
$(c)$ Seed inside the fruit
$(d)$ Embryo sac inside the ovule