A number of mosquito populations are today resistant to DDT, even though those species were not resistant to DDT when it was first introduced. Biologists would explain that DDT resistance evolved in mosquitos because: A. A few mosquitos were probably resistant to DDT before it was ever used. B. Mosquitos learned to adapt to their environment. C. Individual mosquitos built up an immunity to DDT after being exposed to it. D. Mosquitos needed to be resistant to DDT in order to survive.

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A:

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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.