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Two types of sticklebacks (fish), benthic and limnetic, live in Paxton Lake, British Columbia. The benthic type has the same number of chromosomes as the limnetic type. Researchers working on the sticklebacks have made the following observations:1.) Limnetic and benthic sticklebacks differ in number of dorsal spines, number of lateral plates, and presence of a pelvic girdle.2.) Limnetic and benthic stickleback males build their nests in the same region on the nearshore lakebottom of Paxton Lake. However, benthic males select heavily vegetated areas while limnetic males select bare areas of the lake bottom. Limnetic and benthic males differ in courtship behaviors.3.) When given a choice in laboratory experiments, male and female benthics and limnetics choose to mate with their own kind.4.) Benthics are stout-bodied fish with wide mouths that feed on invertebrates in the mud in the shallow margins of the lake. Limnetics are slim-bodied fish with narrow mouths that feed on zooplankton in the center of the lake.5.) 1-2% of sticklebacks in Paxton Lake are natural hybrids.6.) Lab-bred hybrid fish were released in a small BC lake that lacked a resident stickleback population. 20 years later, a small, healthy population of sticklebacks is well established in the lake.The speciation process occurring in the sticklebacks isA.) AllopatricB.) SympatricC.) An example of polyploidyD.) Both A and C.E.) Both B and C.

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