Biology, 02.09.2019 22:20 am2016832

Most cnidarians have two layers of cells that are organized into tissues that have specific functions.
a. true
b. false

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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.

Answer from: Quest

silty loam

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Use figure 5-1 to determine what a soil is called if it has 20 percent clay, 60 percent silt, and 20

Answer from: Quest

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.

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