sentences:  Evidence of this behavior had been postulated ever since Charles Darwin's time and has mostly relied on circumstantial findings of the occasional dead aquatic invertebrate in the utricle (digestion chamber).In 1975, however, British botanist Yolande Heslop-Harrison discovered digestive enzyme activity in "G. africana".Later, in 1998, Wilhelm Barthlott and his colleagues concluded through experimentation that "Genlisea" attracts prey chemotactically, traps them in the corkscrew "lobster pot" trap, digests them with enzymes produced by the plant, and then absorbs the nutrients.