The basic number of chromosomes is designated by 2n and is also called somatic number. In normal human karyotype, the somatic number is 46, so 2n = 46. Human karyotype is also composed of 22 autosomes.
Let's just say that everyvyear, many people either get the vaccination, or the flu. These people are left immune to the strain of flu that they were vaccinated/infected with so the number of people who can get and pass on that form of flu (think of these people as that flu strain's "habitat") is reduced. If some of that flu mutates sufficiently that the immune systems of those previously infected vaccinated people no longer recognize it, then it's habitat is expanded back to the original size again.
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Hydra reproduce through a process called budding, where a tiny knob-like structure begins to grow. As it continues to grow, it falls off, producing a new hydra.
The correct answer would be option D. The statement that best describes what plasma is in chemistry is, an electrically charged gas with very high kinetic energy. A plasma is defined as a hot ionized gas, which exists at super high temperatures.