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Do all adult chordates display the chordate features? Explain
The notochord is an elongate, rod-like, skeletal structure dorsal to the gut tube and ventral to the nerve cord. The notochord should not be confused with the backbone or vertebral column of most adult vertebrates. [ The notochord appears early in embryogeny and plays an important role in promoting or organizing the embryonic development of nearby structures. In most adult chordates the
notochord disappears or becomes highly modified. In some non-vertebrate chordates and fishes the notochord persists as a laterally flexible but incompressible skeletal rod that prevents telescopic collapse of the body during swimming. The nerve cord of chordates develops dorsally in the body as a hollow tube above the notochord. In most species it differentiates in embryogeny into the brain anteriorly and spinal cord that runs through the trunk and tail. Together the brain and spinal cord are the central nervous system to which peripheral sensory and motor nerves connect. The visceral (also called pharyngeal or gill) clefts and arches are located in the pharyngeal part of the digestive tract behind the oral cavity and anterior to the esophagus. The visceral clefts appear as several pairs of pouches that push outward from the lateral walls of the pharynx eventually to reach the surface to form the clefts. Thus the clefts are continuous, slit-like passages connecting the pharynx to the exterior. The soft and skeletal tissues between adjacent clefts are the visceral arches. The embryonic fate of the clefts and slits varies greatly depending on the taxonomic subgroup. In many of the non-vertebrate chordates, such as tunicates and cephalochordates, the clefts and arches are elaborated as straining devices concerned with capture of small food particles from water. In typical fish-like vertebrates and juvenile amphibians the walls of the pharyngeal clefts develop into gills that are organs of gas exchange between the water and blood. ]
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User: Vertebrates are chordates, but not all chordates are vertebrates. How can this be?

User: Do all adult chordates display the chordate features? Explain

Weegy: The notochord is an elongate, rod-like, skeletal structure dorsal to the gut tube and ventral to the nerve cord. The notochord should not be confused with the backbone or vertebral column of most adult vertebrates. [ The notochord appears early in embryogeny and plays an important role in promoting or organizing the embryonic development of nearby structures. In most adult chordates the notochord disappears or becomes highly modified. In some non-vertebrate chordates and fishes the notochord persists as a laterally flexible but incompressible skeletal rod that prevents telescopic collapse of the body during swimming. The nerve cord of chordates develops dorsally in the body as a hollow tube above the notochord. In most species it differentiates in embryogeny into the brain anteriorly and spinal cord that runs through the trunk and tail. Together the brain and spinal cord are the central nervous system to which peripheral sensory and motor nerves connect. The visceral (also called pharyngeal or gill) clefts and arches are located in the pharyngeal part of the digestive tract behind the oral cavity and anterior to the esophagus. The visceral clefts appear as several pairs of pouches that push outward from the lateral walls of the pharynx eventually to reach the surface to form the clefts. Thus the clefts are continuous, slit-like passages connecting the pharynx to the exterior. The soft and skeletal tissues between adjacent clefts are the visceral arches. The embryonic fate of the clefts and slits varies greatly depending on the taxonomic subgroup. In many of the non-vertebrate chordates, such as tunicates and cephalochordates, the clefts and arches are elaborated as straining devices concerned with capture of small food particles from water. In typical fish-like vertebrates and juvenile amphibians the walls of the pharyngeal clefts develop into gills that are organs of gas exchange between the water and blood. ]
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Asked 5/16/2010 2:50:25 PM
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Lateral area of the Great Pyramid and the two smaller pyramids.
Weegy: First, you need some measurements. [ The dimensions, to the nearest tenth of a meter of the Great Pyramid of Giza, determined by various expeditions are: height = 146.515 m base = 230.363 m Half the base is: 230.363 / 2 = 115.182 m Using the Pythagorean Theorem we get the slant height: s² = 146.515² + 115.182² s² = 34,734 m² s = v34,734 s = 186.369 m Now technically the Great Pyramid actually has concave sides and because of erosion, the limestone facing that made it a smooth pyramid is gone. However, let's ignore that and just assume it was a mathematically perfect square pyramid. base = 230.363 m slant height = 186.369 m Each face is a triangle with an area of ½ * base * slant height. And there are 4 of them. So the total lateral surface area would be given by: 2 * base * slant height = 2 * 230.363 * 186.369 = 85,865 m² That assumes you just want the exposed surface area, not the area of the base. If you want that as well, add the area of the square (230.363² = 53,067 m²) You can convert these to square feet if you like... Answer: Lateral surface area = 85,865 m² (or 924,243 sq. ft) Total surface area (including base) = 138,932 m² (or 1,495,451 sq. ft ] (More)
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Asked 5/17/2010 8:07:49 AM
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The two smaller pyramids' measurements:
Weegy: what are they? (More)
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Asked 5/17/2010 8:46:37 AM
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The two smaller pyramids' measurements:
Weegy: measurement: 1: the length, height etc of something Example:Take measurements of the room before you buy any new furniture. 2: the act of measuring something;measurement of Example:accurate measurement of body temperature [ ] User: The two smaller pyramids' (in Egypt) measurements (More)
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Asked 5/17/2010 8:50:52 AM
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Find the volume of the square pyramid. Bases-18. Height-19
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Updated 5/11/2010 9:23:31 AM
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V=hB/3 (Where B is the Area of Base) V= 19*324/3; V=2052
Added 5/11/2010 9:23:31 AM
Find the volume of the square pyramid. Bases-18. Height-19
Weegy: 114 (More)
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Asked 5/11/2010 9:06:43 AM
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