Answer:
Ventilation and mixing outdoor air with indoor air
Explanation:
microbes made beverage and food go bad
Answer: they all have a nucleus
Explanation:
Unlike prokaryotes, the dna is neatly inside the nucleus and not scarttered around, The types of eukaryotes are plant and animal cells
The answer is B. Paleozoic
This era was the first era where insects, amphibians, and reptiles roamed the Earth.
Hope this helps!