Letters to the editor
By Science News, 16:01 PM June 13, 2013
I found the recent article “Evolutionary enigmas” (SN: 5/18/13, p. 20) fascinating because I know of another example of an invertebrate animal possessing a “strictly vertebrate” quality. As a high school human anatomy and physiology teacher, I sometimes have my students test the effects of the constituents in cigarette smoke on live Daphnia heart rates. These arthropods are known to have myogenic hearts, whereas most arthropods have neurogenic hearts. Myogenic hearts co...
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