I’m pretty sure the answer is b
I would say that this is true, although there is no absolute answer to this question and one could also find arguments against it.
But, we could set the beginning of global warming to 1940s -that's when the average temperatures started rising. Also 1940s is when the <span> International Union for the Conservation of Nature and Natural Resources was founded - so it's around the same time!</span>
It can be harmful for humans because you do not want to hold the drug resistant bacteria within you because it can get you sick! If you take a certain medication over and over again, it will kill most of the bacteria that makes you ill, however it also leaves some bacteria that become RESISTANT towards the certain medication, resulting in the bacteria that is resistant reproducing and getting you sick once again.
<span>The insect might be an unknown variation or a new species.</span>