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Define Deuterostomes in animal kingdom?
Coelomate animals are thought to have separated into two divergent lines of evolution in terms of the way embryos develop. In the embryonic development sequence of one group, the mouth forms before the anus forms. These animals are referred to as protostomes. In the second group of coelomates, the anus forms prior to the development of the mouth, and these organisms are called deuterostomes. The members of two Phyla, the Echinodermata and the Chordata, have the deuterostome type of embryological development. Three phyla of uncertain affinity are collectively referred to as the lopophorates. they share a common structure called the lophophore, a u-shaped body fold around the mouth that bears tentacles lined with cilia. The lophophore's function is to collect food.
What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and o
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List structures found in unicellular organisms that are an adaptation to their free-living life and are not usually found in the cells of multicellular organisms.
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