Which of the following is a valid observation about the coevolution of angiosperms and their pol...

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Which of the following is a valid observation about the coevolution of angiosperms and their pollinators?
(a) Solitary bee species pollinate different species of plants
(b) Moth-pollinated flowers bloom only in the morning
(c) Most bird pollinators are native to Europe
(d) The effective range of wind pollination is \( 100 \mathrm{~km} \)
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