When examining population pyramids, which basic geometric shape indicates a rapidly growing population? (1 point)
a triangle on top of a rectangle, as in (a)
◎ a modestly tapering triangle, as in (c)
a triangular shape with a very broad base, as in (b)
a rectangular shape that tapers only slightly at the top, as in (d)
a very short triangular shape, a shortened version of (a)