From Matzke-Karasz et al. 2009. A. Zenker Organ, a specialized organ modified from the vas deferen that serves asa pump for giant sperm. B&C The heavily coiled giant sperm with anteriour (an) and ...
Scientists have identified the oldest male fossil animal yet discovered. It is an ocean-dwelling creature from 425-million-year-old rocks in the UK. Unusually, its soft parts are well preserved as ...
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