are animals in which the blastopore develops into the mouth.ĭ. Which of the choices makes the sentence that follows incorrect? You know that deuterostomesĬ. A zoologist studies an animal that is a deuterostome. Pseudocoelomates have a body cavity that is located between the ectoderm and the endoderm. Coelomates have a fluid filled cavity that develops entirely within the mesoderm.ĭ. Coelomates have a body cavity lined with mesodermal cells.Ĭ. Each of the following statements is correct with the exception of one. Bilateral symmetrical animals have evolved three body cavity plans. What are the three animal phyla that dominate animal life on land?Į. Select the correct choice to answer the following question. Eumetazoa-definite symmetry tissues organizedĮ. triploblastic-ectoderm, mesoderm, and endodermĭ. Which of the following terms is mismatched with its meaning or characteristics?ī. having cells organized into tissue layers. distinct embryonic layers which differentiate into adult tissues.Į. tissues organized into organs and organ systems.Ĭ. Molecular analysis suggests that the rapid diversification during the Cambrian explosion may have been due to evolution of -.ī. they show great diversity in size, form, and structure.Į. they develop from a zygote in a characteristic embryonic development.ĭ. they can move more rapidly and in more complex ways than members in other eukaryotic kingdoms.Ĭ. their cells lack rigid cell walls and are flexible.ī. Animals are distinct among multicellular organisms in all of the following features exceptĪ. Deuterostomes are animals in which the mouth and anus develops from the blastopore, depending on the species.ġ1. Protostomes are animals in which the mouth or anus develops from the blastopore, depending on the species. Deuterostomes are animals in which the mouth develops from the blastopore and the anus develops secondarily later in their development. The anus or anal pore of protostomes develops from the second opening. Protostomes are animals in which the mouth develops from the blastopore. Deuterostomes are animals in which the anus develops from the blastopore and the mouth develops secondarily later in their development. The mouth of protostomes develops from the second opening. Protostomes are animals in which the anus develops from the blastopore. Of the following combination of statements about protostomes and deuterostomes, which choice is correct? A. In the case of protosomes, the blastopore will develop into the mouth while in deuterostome it develops into the anus.2. Another significant distinguishing feature that sets apart protosomes from deuterostomes is the purpose of the blastopore. The layer between these 2 layers is known as mesoderm and it gives rise to muscles and connective tissue. The outer layer ectoderm forms the nervous system and the epidermis. The blastopore cells start migrating inwards to create an inner tube that will later develop into an endoderm that gives rise to the GI tract and digestive system. The development of blastopore starts the process of gastrulation. These 3 germ embryonic cells in a triploblastic organism give rise to all the organs and tissues. Gastrulation starts at this stage leading to the formation of 3 germ layers. The arrangement of cells changes such that blastoderm, a layer of cells envelope blastocoel that is a yolk or fluid-filled cavity and this forms a blastula. Protostomes exhibit spiral cleavage wherein the cleavage occurs long angle resulting in spirally arranged blastomeres.
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