Question

27) There is no best single characteristic that describes "life" as we know it in this planet. Rather, "Hife is 27) a complex composite of characteristics that are shared by "living" and "non-living objects. A) True B) False 28) 28) The "oxigen revolution facilitated by cyanobacteria had an enormous impact on life in our planet. As a result, the rising concentration of atmospheric oxygen wiped out the prokaryotic organisms that flourished in the CO2 rich envirorment; none of these early prokaryotic organisms has survived to present times. A) True B) False

Answer 1

27) true

life is a complex composite of both biotic (living) and abiotic (non-living) characteristics which interact in order to make life possible. For eg. cells, organisms (living) intake gases nutrients, etc (non-living) and excrete out wastes, unwanted gases, etc (non-living).

28) false

till date we do have anaerobic microbes that need complete absence of oxygen for their survival and growth.