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Subphylum Trilobitomorpha
Subphylum Trilobitomorpha involves the trilobites. All species are extinct and the fossils point out that they were all marine forms belonging to Paleozoic era. They are the most primitive of all arthropods. Body was categorized into three lobes by means of two furrows longitudinally; distinct head, thorax and abdomen were present. Appendages biramous it appears that trilobites had a range of habits; they included epibenthic, crawling, burrowing, planktonic and swimming forms.
Cell structure and function All organisms, whether simple or complex, plants or animals. are composed of cells. For example, a bacterium or an amoeba is made up of just one cel
what is the term used for study of sponges,protozoa,colentreta,molusca,fish,aves,mammal
It arises from a one embryonic cell known as neuroblast Types of neuron: According to number of process¬ (a) Unipolar: Only axon is there. e.g. mesencephalic nucleus. (b)
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In an adult male, which of the following is true? A. The plasma membranes of Leydig cells contain LH receptors. B. The plasma membranes of Sertoli cells contain FSH receptor
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