An animal that has an internal body cavity completely lined with mesoderm is cal

Question

An animal that has an internal body cavity completely lined with mesoderm is called a(n) _____ In all deuterostomes, by contrast, the cells divide parallel to and at right angles to the polar axis. This pattern is called _____ Two outwardly dissimilar groups, the _______ and the chordates, together with a few other small phyla, constitute the deuterostomes. What three characteristics are common to all chordates? a) b) c) Why don't we find all three of these chordate characteristics in our own bodies? ____________ From you knowledge of the evolution of invertebrate and vertebrates provide evidence for or against the statement: "Evolution adds onto or modifies what already exists? Explain. _______ Discuss three major changes in structure and functions are seen in terrestrial groups as compared with aquatic groups? _______ Cilia is associated with the feeding apparatus of ______. a) annelids b) coral animals c) tapeworms d) sponges Which extant chordates are postulated to be most like the earliest chordates in appearance? a) nematodes b) adult tunicates c) lancelets d) chondrichthyans

Explanation / Answer

14. Coelomata. A body cavity completely lined by mesoderm is called Coelom so animals possess coelom are called coelomate animals or Coelomata

15. Radial Cleavage .It means the dividing cells form a radius away from the polar axis.

16. Echinodermata. Deuterostome includes 3 clades namely: Echinodermata, Hemichordata and Chordata.In Deuterostome 'Blastopore' becomes the anus.

17. a) Notochord provides skeletal support and develop into vertebral column

b) Hollow Nerve cord giving rise to Central nervous system.

c) Pharyngeal Pouches that develop into gill arches in bony fishes and into jaw and inner ear in terrestrial animals

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