<span>The measles, mumps, and rubella vaccine is the live, weakened measles virus. The vaccine is made from an attenuated form of the virus and combined with protein or small viruses and bacteria extracted from the virus. Nucleic acid vaccine is a vaccine that is attenuated whole-agent vaccine.</span>
In this kind of population, the make up of the population's gene pool will remain virtually the same as long as these conditions hold. In this kind of situation, no evolution can take place, all thing will remain the same. For evolution to occur, competition must exist.
<span>The answer is : Both have true necks, while eusthenopteron has no neck. </span>We know that tiktaalik is more closely related to acanthostega than it is Ichthyostega eusthenopteron because Tiktaalik and Acanthostega both have true necks while eusthenopteron has none.
True, Methane is a greenhouse gas
I would say D and A are your answers :)
