The right answer is A.
Plant species are particular in their ability to produce oxygen and carbohydrates through photosynthesis. The plant, just like the animals also needs to breathe so that these cells survive, so it is forced to take some of the oxygen and carbohydrate produced by photosynthesis to operate these cells through cellular respiration.
I would say A because if the ball is rolling down the hill the it won't stop till it hits the bottom.
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Explanation:
Gas poisoning in our environment is a major problem due to its high incidence. In the specific case of carbon monoxide poisoning, it is the leading cause of death due to involuntary poisoning in our environment, often coexisting with cyanide poisoning. Both poisonings can be serious, based on their diagnosis on the mere suspicion of the doctor. In addition, its importance lies in the fact that both poisonings have a specific treatment. Normo or hyperbaric oxygen therapy is the treatment of choice for carbon monoxide poisoning. In the case of cyanide poisoning, hydroxocobalamin is today the treatment of choice, as it has proven to be an effective antidote.