During courtship males of the fiddler crab sometimes build sand hoods at the entrances of their burrows, to which they attract females for mating with claw waving and other displays. Researchers are interested to determine how hoods affect male attractiveness. Researchers conducted experiments that controlled for other differences in courtship behavior between builders and nonbuilders by removing hood builders' hoods and adding hood models to nonbuilders' burrows. a) What type of research design was used by the researchers?  b) Is it a type of descriptive research or inferential research? Why?

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