It is very true that masculinity and femininity are very strongly dependent on the society in which these terms are used. While there are genetic differences underlying the phenotype of being more masculine (having a bigger jaw, more hair on the body), there are also a lot of societal factors determining what is considered to be masculine and what feminine in a society.
The answer that provides a definition of voice that is specific to the domain of English language arts would be (the style and tone that makes a writer's work unique).
Most of the carbon that's stored in plants - and in anything that eats them - is released back into the atmosphere by respiration when the organisms die and are eaten by microbes.
