Why would these modifications be important i. e.
what unique feature does Arthrobotrys have?)​

Forming adhesive trapping nets.

Explanation:

These modifications are important to captured its food and to survive in the environment. Unique feature does Arthrobotrys have is the presence of predatory behaviour. Due to this predatory behaviour of Arthrobotrys, they are able to capture the food such as nematodes and feed on them. The Arthrobotrys belongs to the fungi family Orbiliaceae and have 71 species. This fungi formed adhesive trapping nets in order to capture its food.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs