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.
While most of the thousands of species of nematodes on Earth are not harmful, some nematodes parasitize and cause diseases in humans and other animals. Also, unfortunately, there are many that attack and feed on living plants.What They Are. Often described as wormlike, nematodes are not closely related to true worms.hile most nematodes are beneficial (see Beneficial Nematodes below for more on their role in the garden), a few species of these translucent, unsegmented worms are plant parasites.