Biology, 29.11.2019 04:31 wvtoy4767

Which of the following are characteristics of hagfishes? select one: a. they have a cranium and vertebrae. b. they have a notochord composed of cartilage. c. they have a cranium and a notochord composed of cartilage. d. they have vertebrae. e. they have a cranium.

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Answer from: BrezzyGirl9148

c. They have a cranium and a notochord composed of cartilage

Explanation:

The presence of the vertebral column is the key feature of vertebrates. Cranium and vertebral column constitute the endoskeleton of these organisms. Hagfishes are the jawless fishes that have the skeleton (cranium and notochord) made up of cartilage, rather than bones as it is in other vertebrates. Hagfishes are classified under the class Myxini and are characterized by the presence of notochord as the only axial structure to support the body.

Since hagfishes lack vertebrae, they are sometimes classified as craniates, not as vertebrates. The cartilaginous notochord persists throughout life. It is not replaced by the bony vertebral column. The cartilaginous segments that represent the rudiments of vertebrae are called neural arches.

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.

Answer from: Quest

Yes yes yes very good

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Which of the following are characteristics of hagfishes? select one: a. they have a cranium and ve...

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