In an open system such as a campfire, matter can <span>lose particles, gain particles or exchange particles.</span>
Answer:
The awnser is B
Explanation: no explanation
Answer:
I'm pretty sure the answer is natural selection.
Explanation:
Natural selection acts on phenotypic variations in populations.
Drug "Tolerance" is the status of when the body has become accustomed to a medication and requires more to achieve a same affect. Makes sense wouldn't you say.