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- noun Plural form of
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When we try to construct an animal frame of the simplest conceivable type, that has some such primitive alimentary canal and the two primary layers constituting its wall, we inevitably come to the very remarkable embryonic form of the gastrula, which we have found with extraordinary persistence throughout the whole range of animals, with the exception of the unicellulars -- in the Sponges, Cnidaria, Platodes,
If we inquire as to the origin of these four secondary layers, we learn that they always arise in the same way from the two primary layers; and the latter have the same significance in all the metazoa (i.e., all animals except the unicellulars).
The unicellulars are seen to have the largest variation in, especially for the ig and in regions.
Symbols for categories are: vertebrates, red (square); unicellulars, blue (triangle-up); insects, orange
"There does appear to be a common factor in the case of every mortal organism with more than a single cell-and maybe the unicellulars too, maybe even the prokaryotes and viruses-if only we can find what it is.
The set is composed of 467 prokaryotic chromosomes (435 eubacteria and 32 archaea) and 398 chromosomes from 28 eukaryotes including: 12 unicellulars (