Answer:
B Low Solar Activity
Explanation:
Fluctuations in the amount of insolation (incoming solar radiation) are the most likely cause of large-scale changes in Earth's climate during the quaternary.
They need to replicate themselves to make sure they don't get smaller.
Another thing would be coal. Corresponding with C. We do not have a limited supply of air, although it will get worse and quality, and the same goes with our soil.
Answer:
Organisms from all kingdoms of life, including bacteria, archaea, plants, protists, animals, and fungi, can use cellular respiration
Explanation:
Search it up on google and do research
