LIST I (Microbe) | LIST II (Natural habitat) | ||
A. | Streptomyces | I. | Aquatic habitat |
B. | Influenza virus | II. | Terrestrial Environment |
C. | Spirulina | III. | Sewage treatment |
D. | Giardia | IV. | Airborne pathogen |
In the given figure, which component has thin outer walls and highly thickened inner walls?