what is stimuli? this is in my science homework and i really don't know what it is.

A simple definition of Stimulus is a thing or event that evokes a specific functional reaction in an organ or tissue.

Explanation:

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they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.