With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Sparta was the principal enemy of Athens, between 431 and 404 BC.
text_B: Utricularia , commonly and collectively called the bladderworts , is a genus of carnivorous plants consisting of approximately 233 species -LRB- precise counts differ based on classification opinions ; one recent publication lists 215 species -RRB- .. Utricularia. Utricularia subg. Utricularia. They occur in fresh water and wet soil as terrestrial or aquatic species across every continent except Antarctica .. Antarctica. Antarctica. Utricularia are cultivated for their flowers , which are often compared with those of snapdragons and orchids , especially amongst carnivorous plant enthusiasts .. Utricularia. Utricularia subg. Utricularia. carnivorous plant. carnivorous plant. snapdragons. Antirrhinum. plant. plant. All Utricularia are carnivorous and capture small organisms by means of bladder-like traps .. Utricularia. Utricularia subg. Utricularia. Terrestrial species tend to have tiny traps that feed on minute prey such as protozoa and rotifers swimming in water-saturated soil .. protozoa. protozoa. The traps can range in size from 0.2 mm to 1.2 cm .. Aquatic species , such as U. vulgaris -LRB- common bladderwort -RRB- , possess bladders that are usually larger and can feed on more substantial prey such as water fleas -LRB- Daphnia -RRB- , nematodes and even fish fry , mosquito larvae and young tadpoles .. Daphnia. Daphnia. fish fry. Juvenile fish. mosquito. mosquito. Despite their small size , the traps are extremely sophisticated .. In the active traps of the aquatic species , prey brush against trigger hairs connected to the trapdoor .. The bladder , when `` set '' , is under negative pressure in relation to its environment so that when the trapdoor is mechanically triggered , the prey , along with the water surrounding it , is sucked into the bladder .. Once the bladder is full of water , the door closes again , the whole process taking only ten to fifteen thousandths of a second .. Bladderworts are unusual and highly specialized plants , and the vegetative organs are not clearly separated into roots , leaves , and stems as in most other angiosperms .. leaves. leaf. The bladder traps , conversely , are recognized as one of the most sophisticated structures in the plant kingdom .. plant. plant
not_related.