Soon after the coelom begins to form, a researcher injects a dye into the coelom of a deuterostome embryo. Initially, the dye should be able to flow directly into the

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#Question id: 3321

#Section 2: Evolution

When an allele at one locus spreads by natural selection acting on a second locus knows as

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#Question id: 11501

#Section 2: Evolution

According to the endosymbiotic theory of the origin of eukaryotic cells, how did mitochondria originate?

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#Question id: 10894

#Section 1: Ecology

A group of species that interact with each other in their exploitation of a resource gradient are referred to as

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#Question id: 12331

#Section 1: Ecology

The species richness of a community refers to the

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#Question id: 11257

#Section 1: Ecology

Close examination of the yucca-yucca moth mutualism has shown that what appear to be coevolved traits may have been __________ that were critical to the establishment of the mutualism in the first place.