Answer is B. Soil
Explanation:
Secondary succession is one of the two types ecological succession of a plants life. As opposed to the first, primary succession, secondary succession is a process started by an event (e.g. forest fire, harvesting, hurricane, etc.) that reduces an already established ecosystem (e.g. a forest or a wheat field) to a smaller population of species, and as such secondary succession occurs on preexisting soil
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The density of a population of living organisms is usually measured in individuals on one square km. In here we have 50 earthworms on an area of 5 square meters, thus we have 10 earthworms on every square meter. In order to get to the result we need to see first how many square meters there are in one square km. One square km has one thousand meters of length and one thousand meters of width so:
1,000 x 1,000 = 1,000,000 km²
Since we established that we have 10 earthworms on every one square meter, we just need to multiply the number of square meters with the amount of earthworms on every square meter:
1,000,000 x 10 = 10,000,000
So we have a density of 10 million earthworms per square km.
The answer to this question would be lysosome.
Build up of waste material mostly caused by disease in the enzyme that digests the material. Lysosome would be the organ that will hold the material until it was digested. Since it won't digest, the material will be in lysosome forever. The disease itself called lysosomal storage disorder, which was part of the inborn error of metabolism.
Just take that photo and go to google home then google lens and press library and put the photo in and it will find something similar.