Sinkholes are formed when land collapses into cavities underground. A few causes of sinkholes are disturbance of soil (digging for example), water impoundment (dams and basins), and decline of water level (groundwater pumping and droughts).
Acid-fast rods present in sputum typically indicates a mycobacterial infection. Mycobacteria is a type of germ, and it can manifest in different diseases, the most common is Tuberculosis. Acid-fast is namely due to the bacteria's stain retention to the staining procedure after an acid wash.
RNA molecules are produced during transcription, the molecules being the ribonucleotides of mRNA
The answer should be A, inside the bag.
Permeable means allowing certain material to pass through. So if it's permeable to water and iodine, it means it can allow water and iodine to pass through the bag, but doesn't allow starch to go in.
Because iodine can pass through the bag, it can get into the bag filled with starch. But since starch couldn't diffuse out of the bag, the color change is only can be observed inside the bag. When no starch is gone out from the bag, there is no color reaction in the rest of the beaker.
So that answer is A.
