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The sexual cycle of flowering plants involves alternation of sporophyte and gametophyte generations.
Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th
Angioplasty. One form is called balloon angioplasty, shown here. A balloon catheter is threaded into
Despite the traditional focus on males, females actively choose mates and are the driving force in t
Symbolic language may have helped reinforce exclusive sexual relationships within social groups in l
Sexual Development begins in the Seventh week of Gestation