Answer:
Metabolic processes that require oxygen are called aerobic. Metabolic processes that do not require oxygen are called anaerobic.
Explanation:
Um I just looked it up
When oxygen is absent, anaerobic respiration occurs ('an' means without).
Answer:
c
Explanation:
The very primitive and early microorganisms on the earth's surface were protobionts. Protobionts are cell-like microscopic structures, and they are made up of organic and inorganic molecules present in a lipid bilayer membrane. The layers of the lipid membranes were folded into bilayers and transformed into a bubble shape when placed in water. These membranes were selectively permeable and also observed shrinkage and swelling in osmotic conditions. Protobionts also possess the characteristics of reproduction.
(please vote me brainliest)
The layers on the top may be younger, while the bottom layers may be much older.
