Answer:
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Explanation:
A mutation is a change in a DNA sequence. Mutations can result from DNA copying mistakes made during cell division, exposure to ionizing radiation, exposure to chemicals called mutagens, or infection by viruses.
Answer:
Since almost all DNA viruses replicate in the nucleus of infected cells, they must be targeted there. In many cases the entire nucleocapsid enters the nucleus, where uncoating then takes place. In order for new virus to be assembled, both new viral genomes and other virion components (proteins) must be produced.
Explanation:
Answer:
Humans have greatly increased the level of in the atmosphere. O A. argon B. oxygen O . C. carbon dioxide O D. nitrogen
=carbon dioxides
Answer: A
Explanation: A stream terrace basically forms through this process– Temporary base level is eliminated; the stream downcuts upstream from the old temporary base level, and the former floodplain is left well above the present elevation of the stream.