In prokaryotes ( bacteria and archaea ) this usually occurs via a relatively simple process called binary fission, in which each circular genome attaches to the cell membrane and is separated into the daughter cells as the membrane invaginates to split the cytoplasm into two membrane-bound portions.
42.
Here they grow, cavitate, and differentiate into the second larval form shaped like a bladder ( and erroneously believed until the middle of the 19th century to be a separate parasite, the bladderworm ) which is infectious to the definitive host when an invaginated protoscolex is completely developed.
43.
"The taper of Doc's unlimbered knife eased now impromptu through abdominal wall invaginating Ed's belly, eeling unleashed up young Ed's gizzard, nicking Ed's rib, then through range of muscle skewering tissue, pigsticking organ, out the gorge of Ed's vena cava, presenting no more resistance than uprooting a radish ."
