B Nature selection for traits the allow for increased rates of reproduction and survival over traits that don't, is correct.
A is also correct
Answer:
I had a step stool with a shed in a web that looks exactly like this and my dad said it was a black widow shed so idk maybe you should look up black widow sheds because I can't find any.
Explanation:
<span>new scientific investigations lead to new theories</span>
<span>The correct answer is B. Lack of water. When there's no water and you start to dehydrate, your salivary glands start working extra hard because your mouth can't be dry and the salivary glands produce saliva to keep the mouth and the throat dry. If your throat and mouth are dry you can't even swallow.</span>
