I believe the biosphere is fragile, because over time all of the pollution us humans have made; If its from air pulloution, acid rain or even water pollution. the toxic acids over time have made the biosphere and the ozon layer weaker and more thin. which causes the biosphere to become weaker.
Answer and Explanation
Due to technical problems, I was not able to fill the answer and explanations in the corresponding boxes. You will find them in the attached files.
Methanogens can be found in B.human intestines
Roots of plants and synthetic fertilizers can contain oxygen or come into contact with oxygen.
Meiosis I creates 2 diploid cells and meiosis II creates 4 haploid cells.
