Answer:
<u><em>Ozone.</em></u>
Ozone occurs both in the Earth's upper atmosphere and at ground level. Ozone can be good or bad, depending on where it is found. Called stratospheric ozone, good ozone occurs naturally in the upper atmosphere, where it forms a protective layer that shields us from the sun's harmful ultraviolet rays.
Explanation:
I searched and found my answer on Go ogle.
He proposed that over a large period of time natural selection could lead to change in order to better adapt a species to their changing environment
We add a whole number close with respect
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.
