The butterflies all live in the same place and the butterflies are all the same species. Hence, options A and C are correct.
What is species?
A species is often defined as a group of organisms that can reproduce naturally with one another and create fertile offspring.
The butterflies come down at night and gather in clusters. A cluster of butterflies is called a roost or a bivouac. Monarchs migrate alone. They do not travel in flocks the way many birds do.
Hence, options A and C are correct.
Learn more about species here:
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