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Unlike animals, many plant cells, particularly those of the parenchyma, do not terminally differentiate, remaining totipotent with the ability to give rise to a new individual plant. Exceptions include highly lignified cells, the sclerenchyma and xylem which are dead at maturity, and the phloem sieve tubes which lack nuclei. While plants use many of the same epigenetic mechanisms as animals, such as chromatin remodeling, an alternative hypothesis is that plants set their gene expression patterns using positional information from the environment and surrounding cells to determine their developmental fate.
Why are plants able to stop and start dividing cells?
A: information from the environment

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The Bronx is referred to, both legally and colloquially, with a definite article, as the Bronx. (The County of Bronx, unlike the coextensive Borough of the Bronx, does not place the immediately before Bronx in formal references, nor does the United States Postal Service in its database of Bronx addresses.) The name for this region, apparently after the Bronx River, first appeared in the Annexed District of the Bronx created in 1874 out of part of Westchester County and was continued in the Borough of the Bronx, which included a larger annexation from Westchester County in 1898. The use of the definite article is attributed to the style of referring to rivers. Another explanation for the use of the definite article in the borough's name is that the original form of the name was a possessive or collective one referring to the family, as in visiting The Broncks, The Bronck's or The Broncks'.
What is the Bronx's county name?
A: The County of Bronx

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Traditionally the Rajputs, Jats, Meenas, Gurjars, Bhils, Rajpurohit, Charans, Yadavs, Bishnois, Sermals, PhulMali (Saini) and other tribes made a great contribution in building the state of Rajasthan. All these tribes suffered great difficulties in protecting their culture and the land. Millions of them were killed trying to protect their land. A number of Gurjars had been exterminated in Bhinmal and Ajmer areas fighting with the invaders. Bhils once ruled Kota. Meenas were rulers of Bundi and the Dhundhar region.
Members of what tribe were exterminated in Ajmer?
A: Gurjars

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Historical linguistics emerged as an independent field of study at the end of the 18th century. Sir William Jones proposed that Sanskrit, Persian, Greek, Latin, Gothic, and Celtic languages all shared a common base. After Jones, an effort to catalog all languages of the world was made throughout the 19th century and into the 20th century. Publication of Ferdinand de Saussure's Cours de linguistique generale created the development of descriptive linguistics. Descriptive linguistics, and the related structuralism movement caused linguistics to focus on how language changes over time, instead of just describing the differences between languages. Noam Chomsky further diversified linguistics with the development of generative linguistics in the 1950s. His effort is based upon a mathematical model of language that allows for the description and prediction of valid syntax. Additional specialties such as sociolinguistics, cognitive linguistics, and computational linguistics have emerged from collaboration between linguistics and other disciplines.
What method did Chomsky use to develop generative linguistics?
A:
a mathematical model of language