Biology, 18.12.2019 11:31 seanisom7

Animals that are segmented and have jointed appendages and an exoskeleton are members of the phylum: a. mollusca b. annelida c. cnidaria d. arthropoda

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Answer from: borsha255

The correct answer is - d. Arthropoda.

The arthropods are one of the oldest living groups of animals on the planet. Part of this large phylum of animals are the insects, spiders, scorpions, crustaceans. They all have their own unique traits of course, but they also have some that are the same, thus we can say that all the members of this phylum have certain shared characteristics that define them from the other animals.

Some of these shared characteristics are:

- segmented bodies; the bodies are segmented both internally and externally, with some having few segments while some a very large number.

- exoskeleton; they are invertebrates, so they do not have internal bone structure, instead they have external bone structure.

- open circulatory system; the blood is pumped through open spaces called sinuses in order to reach tissues, they lack veins and arteries.

- jointed appendages; all of the extremities are attached to the exoskeleton, enabling them greater flexibility and mobility.

- bilateral symmetry; if an arthropod is vertically cut in half it will be a mirror image as both sides are perfect copies of one another.

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

Answer/// control of balance and equilibrium;

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Animals that are segmented and have jointed appendages and an exoskeleton are members of the phylum:...