Growth is the answer you're looking for I think.
The answer could be (spread), but there isn't much to go on here
Pass on through generations
Answer: Increased consumption of beef, which increases methane production
Explanation:
The reason why nost scientists thought that the first true cells formed on Earth were anaerobic is being shown in the second option :B. because there was no oxygen on early Earth. Paying attention to this fact scientists discovered that first cells were prokaryotes and greatest part of them created oxygen as a toxic by-product of their own metabolism which make them understand how the planet was provided with oxygen and made a conclusion that first cells were anaerobic.
