In the United States, US Postal Stamps are rated in 0.01 cent and up; the postage for a first class letter is 0.44 cents (of normal size and weight).
Trematodes are flattened oval or worm-like animals, usually no more than a few centimetres in length, although species as small as 1 millimetre (0.039 in) (Monogenea) and as large as 7 centimetres (2.8 in) (Fasciolopsis) are known. species that exemplifies the remarkable life history of the trematodes is the bird fluke, Leucochloridium paradoxum. The definitive hosts, in which the parasite reproduces, are various woodland birds, while the hosts in which the parasite multiplies (intermediate host) are various species of snail.
Ecological niche Nematodes are primary producers and play an important role in the breakdown of organic matter in their ecosystem. Nematodes are crucial to our environment, especially to the energy and matter cycle in the biosphere. Nematodes are free-living consumers, specially decomposers, who are responsible for recycling decaying, rotting, organic matter, which is present in almost all ecosystems. Nematodes large population and diversity around the globe, makes them the primary decomposers in most environments.