Your answer would be ORGANISMS, is the lowest level of organization in the environment.
Hope that helps!!!!
Answer:
B pretty sure this is correct
B nitrogen. Nitrogen is a non-metal element that occurs most abundantly in the atmosphere, nitrogen gas (N2) comprises 78.1% of the volume of the Earth's air. It only appears in 0.002% of the earth's crust by mass. Compounds of nitrogen are found in foods, explosives, poisons, and fertilizers.
It is crucial to be aware of and respect the environment because you live off of it. Our earth provides us air, energy, food, and the resources we need to live. When we don't keep our environment clean, and disrespect it, it won't be in as good condition as it should be, and could potentially die out from being mistreated. We need to be aware of our environment to know what we need to do to cater to its needs, so it can cater to ours.
Since you are trying to investigate the possible variables that contribute to reef threats, it is advisable that you do an environmental study between two reefs that have characteristics that are similar or are closely similar. With this, you will be able to identify which is the primary cause of reef threats. Thus the correct answer is B.