a collection of things sharing a common attribute

a body of students who are taught together

people having the same social, economic, or educational status

education imparted in a series of lessons or meetings

a league ranked by quality

a body of students who graduate together

(biology) a taxonomic group containing one or more orders

elegance in dress or behavior

arrange or order by classes or categories

cellular slime molds; in some classifications placed in kingdom Protoctista

someone who shows impressive and stylish excellence

a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed

a lawsuit brought by a representative member of a large group of people on behalf of all members of the group

the class of vertebrates that live on land but breed in water; frogs; toads; newts; salamanders; caecilians

comprising flowering plants that produce seeds enclosed in an ovary; in some systems considered a class (Angiospermae) and in others a division (Magnoliophyta or Anthophyta)

hornworts: in some classification systems included in the class Hepaticopsida

a large class of sedentary marine coelenterates that includes sea anemones and corals; the medusoid phase is entirely suppressed

one of two subgroups of Nematoda used in some classification systems

a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings

a class of Annelida

sometimes classified as an order: sea squirts

large class of higher fungi coextensive with division Ascomycota: sac fungi

sea stars

(ornithology) the class of birds

marine and freshwater eukaryotic algae: diatoms

large class of higher fungi coextensive with subdivision Basidiomycota

oysters; clams; scallops; mussels

true mosses: bryophytes having leafy rather than thalloid gametophytes: comprises orders Andreaeales; Bryales; Dicranales; Eubryales; Sphagnales

octopuses; squids; cuttlefish; pearly nautilus

tapeworms

snakeheads

in some classifications: contains only the order Charales

arthropods having the trunk composed of numerous somites each bearing one pair of legs: centipedes

algae distinguished chiefly by having flagella and a clear green color, their chlorophyll being masked little if at all by other pigments

cartilaginous fishes

all the yellow-green algae having flagella of unequal length

a class of mostly aquatic fungi; saprophytic or parasitic on algae or fungi or plants

class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle

class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle

cone-bearing gymnosperms dating from the Carboniferous period; most are substantial trees; includes the classes Pinopsida (subdivision Pinophytina) and Ginkgopsida (subdivision Ginkgophytina) and Taxopsida (subdivision Taxophytina) which in turn include the surviving orders Coniferales and Taxales (yews) and sometimes Ginkgoales as well as extinct orders such as Cordaitales (of the Carboniferous and Permian)

sea lilies

class of mandibulate arthropods including: lobsters; crabs; shrimps; woodlice; barnacles; decapods; water fleas

motile usually brownish-green protozoa-like algae

photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae

photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins; once thought to be algae: blue-green algae

palmlike gymnosperms: includes the surviving order Cycadales and several extinct orders; possibly not a natural group; in some systems considered a class (Cycadopsida) and in others a subdivision (Cycadophytina or Cycadophyta)

in more recent classifications superseded by the order Fucales

form class; coextensive with subdivision Deuteromycota

marine and freshwater eukaryotic algae: diatoms

comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae