Market share is the percentage of a market (defined in terms of either units or revenue) accounted for by a specific entity.
 In a survey of nearly 200 senior marketing managers, 67% responded that they found the revenue- "dollar market share" metric very useful, while 61% found "unit market share" very useful.
In natural language processing, entity linking, named entity linking (NEL), named entity disambiguation (NED), named entity recognition and disambiguation (NERD) or named entity normalization (NEN) is the task of determining the identity of entities mentioned in text.
 For example, given the sentence "Paris is the capital of France", the idea is to determine that "Paris" refers to the city of Paris and not to Paris Hilton or any other entity that could be referred as "Paris".
 NED is different from named entity recognition (NER) in that NER identifies the occurrence or mention of a named entity in text but it does not identify which specific entity it is.
Spondyloarthropathy or spondyloarthrosis refers to any joint disease of the vertebral column.
 As such, it is a class or category of diseases rather than a single, specific entity.
 It differs from spondylopathy, which is a disease of the vertebra itself.
 However, many conditions involve both spondylopathy and spondyloarthropathy.
Lewisia is a plant genus, named for Meriwether Lewis who encountered the species in 1806.
 The native habitat of "Lewisia" species is north facing cliffs in the western part of North America.
 Local Native Americans ate the roots, which have also been used to treat sore throats.
A Bahamas Executive Entity, sometimes referred to simply as an Executive Entity, is designed to encaspsulate powers currently existing in wealth management and estate planning structures within a new form of legal entity.
 The Executive Entity was born out of legislation passed by The Commonwealth of The Bahamas and which came into force on 2 February 2012.
 At the time of its statutory introduction, the Executive Entity was considered the first of its type in the world.
In legal English, the seat of a corporation or organisation, as a legal entity, is the location of its headquarters.
<ref name="T1012/03"> Decision T 1012/03 of December 1, 2006 of the Boards of Appeal of the European Patent Office, Reasons 27.
</ref> According to international and national procedural law, "specific legal actions with legal effect for and against the legal entity can be performed at the seat of this entity."
 However, "the term 'seat' is sometimes also used in a broad sense without a specific legal meaning.
 In this case [it] only defines where an entity is located and does not mean that this location is a legal seat where specific juridical acts can be performed."
Leucophyta is a plant genus which is endemic to Australia.
 The genus was first formally described by botanist Robert Brown in 1817.
The grandmother cell is a hypothetical neuron that represents a complex but specific concept or object.
 It activates when a person "sees, hears, or otherwise sensibly discriminates" a specific entity, such as his or her grandmother.
 The term was in use at least as early as 1966 amongst staff and students in the Department of Experimental Psychology, University of Cambridge, England.
 A similar concept, that of the gnostic neuron, was proposed two years later by Jerzy Konorski.
Incorporation is a phenomenon by which a grammatical category, such as a verb, forms a compound with its direct object (object incorporation) or adverbial modifier, while retaining its original syntactic function.
 The inclusion of a noun qualifies the verb, narrowing its scope rather than making reference to a specific entity.
An advanced persistent threat is a set of stealthy and continuous computer hacking processes, often orchestrated by a person or persons targeting a specific entity.
 An APT usually targets either private organizations, states or both for business or political motives.
 APT processes require a high degree of covertness over a long period of time.
 The "advanced" process signifies sophisticated techniques using malware to exploit vulnerabilities in systems.
 The "persistent" process suggests that an external command and control system is continuously monitoring and extracting data from a specific target.
 The "threat" process indicates human involvement in orchestrating the attack.

Question: Lewisia and Leucophyta, are a type of which specific entity?
Answer: plant genus