John decided to move from agriculture to the manufacturing sector. he abandoned his farm and shifted to a city. after a few years, when john visited
his farm, he found the land covered with goose grass. a few years later, the land was covered with small shrubs. john's land has been covered with
maple trees for many years now.
*blank*succession occurred on john's land and the maple trees represent the*blank*
community.

Secondary, Climax

Explanation:

Because John disrupted the initial ecosystem community through tillage, this is called secondary succession. The soil’s first recolonized y fast-growing plants with  short life cycles (annual & perennial plants) such as the goosegrass in this case. Then intermdiate plants take over such shrubs in this case. The climax community is the ultimate plant with long life cycles- in this case, the maple trees. The ecosystem is considered stable until the next disruption.  

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answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.