Answer:
C. a mutation causes a specific variation within the population
This is true that the pressure in the mesosphere is so low that a person could not be in this layer without a spacesuit.
The mesosphere is the region of the earth's atmosphere which is above the stratosphere and below the thermosphere. It has a very low temperature and pressure. The top of the mesosphere is the coldest part of Earth's atmosphere.
“Matter is cycles in an ecosystem” -that’s what it means it is what it is. Thank me later
The original surviving bacteria passed a resistance to the antibiotic on to the next generation.