Explanation:
A true friend would care about you like nobody else would they would always tell the truth to you or someone they would never lie to you the way they are acting can help identify too
The correct answer of the given question above would be option C. One of the human activities that would contribute in the increasing carbon dioxide levels and toxins in the atmosphere would be the burning of oil and coal. Burning of oil and coal would produce more carbon dioxide, which contributes to the formation of the greenhouse effect.
Pathogens are any form of a disease causing bacteria, virus or any other microorganism. When they infect an organism, that organism now has to allocate precious resources in the form of energy in order to fend off the infectious microorganisms. In some other cases, an infection could be fatal to an organism completely and "stability" wouldn't really be the biggest worry for that organism.
In conclusion, if you're talking about a larger, more evolved organism with a working immune system. Pathogens require a lot of energy to fight, and for some small organism without a developed immune system, pathogens could throw them off completely.
If you mean classic doppler effect, the C would be correct.