Remember that a biotic factor is a living component in an ecosystem that affects the population of another organism. So that means that the answer is B.
There are both natural and human sources of carbondioxide<span> emissions. Natural sources include decomposition, ocean release and </span>respiration<span>. Human sources come from activities like cement production, </span>deforestation<span> as well as the burning of </span>fossil fuels<span> like </span>coal, oil<span> and </span>natural gas<span>.</span>
I think marine, but I’m not so sure
