Titlebook: Parasites and Western Man; R. J. Donaldson (Director of Studies) Book 1979 MTP Press Limited 1979 Parasitic Infections.hygiene.infection.i

Nomadic

Cestodes and Trematodes,segments towards the hind end of the worm are gravid and in effect are bags containing many thousand eggs. Subsequent development of the eggs varies according to the species of worm and will be described in the accounts of the individual parasites.

独白

无聊的人

Flagging

移动

Protozoa,leus consists of a membrane with a network of fine filaments inside it; on this membrane and on the enclosed network are arranged granules of chromatin. Inside the nucleus is a mass, usually central in position and roughly circular in shape, known as the karyosome.

HOWL

Insects (Hexapoda),The insects are both an ancient. and a numerous. group of animals. Their long phase of adaptive radiation from their origins in the Palaeozoic, and their flexible lines of evolution have produced a modern insect fauna of extreme diversity. Yet nearly all insects retain clear evidence of their origins and relationships.

Soliloquy

不确定

Criteria

CRACY

Mites and Ticks,da. Unlike insects, in which the head, thorax and abdomen are easily recognized, in the Acarina signs of segmentation are lost and the cephalothorax—formed by fusion of the head and thorax—is fixed with the abdomen. The anterior segment of the body carries the mouthparts, forming a false head known