In addition to re-writing the classification of annelids and 3 previously independent phyla, the molecular phylogenetics analyses undermine the emphasis that decades of previous writings placed on the importance of segmentation in the classification of invertebrates. Polychaetes, which these analyses found to be the parent group, have completely segmented bodies, while polychaetes' echiurans and sipunculan offshoots are not segmented and pogonophores are segmented only in the rear parts of their bodies. It now seems that segmentation can appear and disappear much more easily in the course of evolution than was previously thought. The 2007 study also noted that the ladder-like nervous system, which is associated with segmentation, is less universal previously thought in both annelids and arthropods.[n 2]
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What nervous system structure is less univeral among annelids than was thought before 2007?
Ah, so.. ladder-like

On 7 June 1981, the Israeli air force destroyed Iraq's sole nuclear reactor, in order to impede Iraq's nuclear weapons program. The reactor was under construction just outside Baghdad. Following a series of PLO attacks in 1982, Israel invaded Lebanon that year to destroy the bases from which the PLO launched attacks and missiles into northern Israel. In the first six days of fighting, the Israelis destroyed the military forces of the PLO in Lebanon and decisively defeated the Syrians. An Israeli government inquiry – the Kahan Commission – would later hold Begin, Sharon and several Israeli generals as indirectly responsible for the Sabra and Shatila massacre. In 1985, Israel responded to a Palestinian terrorist attack in Cyprus by bombing the PLO headquarters in Tunis. Israel withdrew from most of Lebanon in 1986, but maintained a borderland buffer zone in southern Lebanon until 2000, from where Israeli forces engaged in conflict with Hezbollah.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When did the Israeli air force destroy Iraq's sole nuclear reactor?
Ah, so.. 7 June 1981

During mutualistic symbioses, the host cell lacks some of the nutrients, which are provided by the endosymbiont. As a result, the host favors endosymbiont's growth processes within itself by producing some specialized cells. These cells affect the genetic composition of the host in order to regulate the increasing population of the endosymbionts and ensuring that these genetic changes are passed onto the offspring via vertical transmission (heredity).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who offers a location for the host cell to vertically transmit nutrition?
Ah, so..
unanswerable