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' flat animals ') [3] is a phylum of free-living (non-parasitic) marine invertebrates. [4] [5] They are blob-like animals composed of aggregations of cells. Moving in water by ciliary motion, eating food by engulfment, reproducing by fission or budding, placozoans are described as "the simplest animals on Earth."
A variety of hypotheses have been advanced based on the few morphological characteristics of this simple organism that could be identified. More recently, a comparison of the Trichoplax mitochondrial genome suggested that Trichoplax is a basal metazoan—less closely related to all other animals including sponges than they are to each other. [16]
Drawing of Foa fo (5 letters). Aha ha Menke, 1977 – Family Crabronidae.This species of Australian wasp was named as a joke by entomologist Arnold Menke.He mentioned later that it was named for his exclamation "Aha, a new genus", when he first saw the specimen, with fellow entomologist Eric Grissell doubtfully responding "ha".
The word "protozoa" (singular protozoon) was coined in 1818 by zoologist Georg August Goldfuss (=Goldfuß), as the Greek equivalent of the German Urthiere, meaning "primitive, or original animals" (ur-'proto-' + Thier 'animal'). [11] Goldfuss created Protozoa as a class containing what he believed to be the simplest animals. [3]
The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia.
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All animals need to keep the concentration of dissolved substances in their body fluids at a fairly constant level. Internal parasites and free-living marine animals live in environments with high concentrations of dissolved material, and generally let their tissues have the same level of concentration as the environment, while freshwater ...
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