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Bilateral - Metazoa
Bilaterally symmetrical animals have the major axis running from head (anterior) to tail (posterior). They have a ventral (lower) and dorsal (upper) surface that are different from each other. They have only two sides that look alike, the right and left. The animal can be divided into just two identical halves through a plane which passes from anterior to posterior end. Almost all animals including human beings except for sponges, ctenophores and cnidarians show bilateral symmetry.
Adult echinoderms, though radially symmetrical (pentamerous) have larvae that are bilateral. This is because they have evolved from bilaterally symmetrical ancestors. In general, bilateral animals that adopt a sessile existence commonly exhibit a shift towards radial symmetry. The shift may be slight as in acorn barnacles where only protective circular wall plates are arranged radially or the shift may be profound as in the case of sea stars or starfishes. Bilateral animals are called Bilateria.
Which of the following does not support evolution? biogeography the fossil record comparative anatomy radiometric dating All of these choices are evidence of/support evolution.
Evolution of Horse - Credit to Prof. C. Marsh (1879) of Yale University for complete work. S.No Fo ssil/Genus Period
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Once quite widespread throughout Asia and Africa, there has been a large reduction of the cheetah's habitat and numbers though it is still seen in widely separated areas of Africa.
During final stage of cell division, mitotic apparatus disappears, chromosomes become attenuated, centrioles duplicate and split, nuclear membrane becomes reconstituted and nucleol
Q. What do you mean by Pericardial effusion? Collection of fluid in the pericardial sac is known as Pericardial effusion. All cases of pericarditis can lead to pericardial effu
Give one example in each case of the usefulness of bacteria in (a) a natural environment, (b) an industrial process. (a) In a natural environment bacteria brin
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