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18 February, 10:24

Most cnidarians have two layers of cells that are organized into tissues that have specific functions.

a. True

b. False

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Answers (1)
  1. 18 February, 11:06
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    The answer is TRUE. Most cnidarians have two layers of cells that are organized into tissues: Epidermis and Gastrodermis.

    Explanation:

    Cnidarians' basic body organization is simple: It is a hollow structure composed of two cellular layers:

    epidermis, which is the external layer, gastrodermis which is the internal layer, composed by lining cells in the gastrovascular cavity.

    Between these two there is the mesoglea that varies from a thin, non-cellular membrane to a mucous, fibrous, thick membrane with amebocytes.

    Epidermis and gastrodermis originate from two embryonic tissues, the ectoderm, and the endoderm.

    The epidermis is formed of five types of cells with different functions: epitheliomuscular, interstitial, cnidoblasts, secretors, and sensorial.

    The gastrodermis is composed of nutritive cells, glandular enzymatic cells, secretory cells, and sensorial cells.
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