Organisms in which the circulation fluid is distinct from the tissue fluid are also likely to have   A)branched tracheae and multiple tracheoles B)an open circulatory system and large tissue sinuses filled with hemolymph. C)a closed circulatory system and extensive numbers of capillaries D)a gastrovascular cavity and closed digestive system E)none of these are correct

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Q: arterioles

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A: Amswer is b.) Antigen.

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A: Answer is B.) Salamander.

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A: Here we have to state the function of the given systems.

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Viral Infections

Viruses are abundantly found, minute entities that have genetic material enclosed within a protein coat. The proteinaceous material enclosing the genetic material of the virus is called a capsid. The genetic material could be either DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). A virus is too minute to be looked at with naked eyes and therefore visualized with the help of a microscope. They are acellular entities that require a host for processes, such as replication, transcription, translation and multiplication. Plants, animals, and bacteria act as host wherein the virus reproduce. Viruses cannot multiply outside the host's body and thus are considered nonliving outside the host body.