Alpheoidea is a superfamily of shrimp containing the families Alpheidae, Barbouriidae, Hippolytidae and Ogyrididae.
The largest organisms found on Earth can be determined according to various aspects of an organism's size, such as: mass, volume, area, length, height, or even genome size.
 Some organisms group together to form a superorganism (such as ants or bees), but such are not classed as single large organisms.
 The Great Barrier Reef is the world's largest structure composed of living entities, stretching 2,000 km , but contains many organisms of many types of species.
A species–area curve describes the relationship between the area of a habitat, or of part of a habitat, and the number of species found within that area.
 Larger areas tend to contain larger numbers of species, and empirically, the relative numbers seem to follow systematic mathematical relationships.
 The species–area relationship is usually constructed for a single type of organism, such as all vascular plants or all species of a specific trophic level within a particular site.
 It is rarely, if ever, constructed for all types of organisms if simply because of the prodigious data requirements.
 It is related but not identical to the species discovery curve.
Safety integrity level (SIL) is defined as a relative level of risk-reduction provided by a safety function, or to specify a target level of risk reduction.
 In simple terms, SIL is a measurement of performance required for a safety instrumented function (SIF).
Poly(amidoamine), or PAMAM, is a class of dendrimer which is made of repetitively branched subunits of amide and amine functionality.
 PAMAM dendrimers, sometimes referred to by the trade name Starburst, have been extensively studied since their synthesis in 1985, and represent the most well-characterized dendrimer family as well as the first to be commercialized.
 Like other dendrimers, PAMAMs have a sphere-like shape overall, and are typified by an internal molecular architecture consisting of tree-like branching, with each outward 'layer', or generation, containing exponentially more branching points.
 This branched architecture distinguishes PAMAMs and other dendrimers from traditional polymers, as it allows for low polydispersity and a high level of structural control during synthesis, and gives rise to a large number of surface sites relative to the total molecular volume.
 Moreover, PAMAM dendrimers exhibit greater biocompatibility than other dendrimer families, perhaps due to the combination of surface amines and interior amide bonds; these bonding motifs are highly reminiscent of innate biological chemistry and endow PAMAM dendrimers with properties similar to that of globular proteins.
 The relative ease/low cost of synthesis of PAMAM dendrimers (especially relative to similarly-sized biological molecules such as proteins and antibodies), along with their biocompatibility, structural control, and functionalizability, have made PAMAMs viable candidates for application in drug development, biochemistry, and nanotechnology.
The Higher Education Price Index (HEPI) is a measure of the inflation rate applicable to United States higher education.
 HEPI measures the average relative level in the prices of a fixed market basket of goods and services typically purchased by colleges and universities through current-fund educational and general expenditures, excluding expenditures for research.
 Educational and general expenditures include the functions of instruction and departmental research, extension and public services, educational programs such as workshops and instructional institutes supported by sponsors outside the institution, student services, general administration and expenses, staff benefits, libraries, and operation and maintenance of the physical plant.
 Sponsored research, sales and services of education departments, and auxiliary enterprises are not priced by HEPI.
 The index is calculated on a fiscal year basis ending each June 30, by the Commonfund Institute, a branch of Commonfund, a non-profit organization devoted to the management of college and university endowments.
ATI video cards can have one of multiple suffixes attached to their name indicating relative level of performance, the use of suffixes was abandoned with the release of Radeon HD 3000 series products, the last two digits of the model number was then used to indicate relative performance of the products, except for the "X2" suffix indicating dual-GPU solutions, such that the product has two GPUs on one PCB.
 Below is the listing of the suffixes used in previous generations of products, in order from least powerful (at the top) to the most powerful.
 (at the bottom)
In biological classification, taxonomic rank is the relative level of a group of organisms (a taxon) in a taxonomic hierarchy.
 Examples of taxonomic ranks are species, genus, family, order, class, phylum, kingdom, domain, etc.
Marine life, or sea life or ocean life, refers to the plants, animals and other organisms that live in the salt water of the sea or ocean, or the brackish water of coastal estuaries.
 At a fundamental level, marine life helps determine the very nature of our planet.
 Marine organisms produce much of the oxygen we breathe.
 Shorelines are in part shaped and protected by marine life, and some marine organisms even help create new land.
Vanabins (also known as vanadium-associated proteins or vanadium chromagen) are a specific group of vanadium-binding metalloproteins. Vanabins are found almost exclusively in the blood cells, or vanadocytes of some ascidians and tunicates (sea squirts).
 The vanabins extracted from tunicate vanadocytes are often called hemovanadins.
 These organisms are able to concentrate vanadium to a level more than 100 times higher than in the surrounding seawater.
 Vanabin proteins seem to be involved in collecting and accumulating this metal ion.
 At present there is no conclusive understanding of why these organisms collect vanadium, and it remains a biological mystery.

Question: Alpheoidea is part of the relative level of a group of organisms that contains what families?
Answer: families Alpheidae, Barbouriidae, Hippolytidae and Ogyrididae