Question: To the south, the Sahara is bounded by the Sahel, a belt of dry tropical savanna with a summer rainy season that extends across Africa from east to west. The southern limit of the Sahara is indicated botanically by the southern limit of Cornulaca monacantha (a drought-tolerant member of the Chenopodiaceae), or northern limit of Cenchrus biflorus, a grass typical of the Sahel. According to climatic criteria, the southern limit of the Sahara corresponds to the 150 mm (5.9 in) isohyet of annual precipitation (this is a long-term average, since precipitation varies annually).
Is there an answer to this question: What type of grass is atypical to the Sahel?

Answer: unanswerable

Question: The French cleric Pierre Gassendi (1592-1665) represented the materialist tradition in opposition to the attempts of Rene Descartes (1596-1650) to provide the natural sciences with dualist foundations. There followed the materialist and atheist abbe Jean Meslier (1664-1729), Julien Offray de La Mettrie, the German-French Paul-Henri Thiry Baron d'Holbach (1723-1789), the Encyclopedist Denis Diderot (1713-1784), and other French Enlightenment thinkers; as well as (in England) John "Walking" Stewart (1747-1822), whose insistence in seeing matter as endowed with a moral dimension had a major impact on the philosophical poetry of William Wordsworth (1770-1850).
Is there an answer to this question: Rene Descartes lived from what year to what year?

Answer: 1596-1650

Question: The final major aspect of identity formation is self-esteem. Self-esteem is defined as one's thoughts and feelings about one's self-concept and identity. Most theories on self-esteem state that there is a grand desire, across all genders and ages, to maintain, protect and enhance their self-esteem. Contrary to popular belief, there is no empirical evidence for a significant drop in self-esteem over the course of adolescence. "Barometric self-esteem" fluctuates rapidly and can cause severe distress and anxiety, but baseline self-esteem remains highly stable across adolescence. The validity of global self-esteem scales has been questioned, and many suggest that more specific scales might reveal more about the adolescent experience. Girls are most likely to enjoy high self-esteem when engaged in supportive relationships with friends, the most important function of friendship to them is having someone who can provide social and moral support. When they fail to win friends' approval or couldn't find someone with whom to share common activities and common interests, in these cases, girls suffer from low self-esteem. In contrast, boys are more concerned with establishing and asserting their independence and defining their relation to authority. As such, they are more likely to derive high self-esteem from their ability to successfully influence their friends; on the other hand, the lack of romantic competence, for example, failure to win or maintain the affection of the opposite or same-sex (depending on sexual orientation), is the major contributor to low self-esteem in adolescent boys. Due to the fact that both men and women happen to have a low self-esteem after ending a romantic relationship, they are prone to other symptoms that is caused by this state. Depression and hopelessness are only two of the various symptoms and it is said that women are twice as likely to experience depression and men are three to four times more likely to commit suicide (Mearns, 1991; Ustun & Sartorius, 1995).
Is there an answer to this question: Which type of self-esteem remains stable throughout adolescence?

Answer: baseline self-esteem

Question: With the collapse of Roman rule in the early 5th century, London ceased to be a capital and the walled city of Londinium was effectively abandoned, although Roman civilisation continued in the St Martin-in-the-Fields area until around 450. From around 500, an Anglo-Saxon settlement known as Lundenwic developed in the same area, slightly to the west of the old Roman city. By about 680, it had revived sufficiently to become a major port, although there is little evidence of large-scale production of goods. From the 820s the town declined because of repeated Viking invasions. There are three recorded Viking assaults on London; two of which were successful in 851 and 886 AD, although they were defeated during the attack of 994 AD.
Is there an answer to this question: What area continued to exist after Londinium was abandoned following the end of Roman rule?

Answer:
St Martin-in-the-Fields