What two elements probably combined together in the least tube containing the steel wool?

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.

b because they naturally adapt to their environment plz mark brainliest

explanation:

because photosynthesis could not occur (apex)

answer is d hope this