Answer:
''Genetic variation occurs from changes in homologous chromosomes during meiosis''.
Explanation:
''Genetic variation occurs from changes in homologous chromosomes''. Genetic variation occurs from a number of techniques such as mutation, random mating, random fertilization, and recombination between homologous chromosomes during the process of meiosis. meiosis is a type of cell division which occurs in the sex cells of the organisms which is responsible for the variation in the body of organisms.
The answer would be D. All of the above
Explanation:

The capsid copies the host cell’s DNA is the role of the capsid play in viral reproduction.
The one that does not describe the relationship between the nucleus and the electron cloud of an atom would be : the mass of the nucleus and electron cloud are balanced.
Ie : The mass of nucleus and electron cloud are always differ from one another
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Limestone contains calcium carbonate which comes from animals that have shells, it already has carbon. Other sources are ocean animals which create shells that combine both carbon and calcium. Their dead bodies also release carbon to the ocean. Limestone is also known as a sedimentary rock that has carbon. Outside the ocean, limestone emits the carbon and becomes part of the carbon cycle. In addition to this, limestones are widely used by people becomes a part of the carbon cycle. Its component is present on asphalt, animal feed.