Answer:
B
Explanation:
Fish take small amounts of oxygen from water bacteria however, i believe do not need oxygen
Answer:
Through radio telescopes :)
Explanation:
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.
