During the process of succession,

producers typically enter a developing ecosystem before consumers.

Explanation:

Ecological succession is the process by which an ecosystem undergoes a series of changes as communities of organisms change their environment and new communities of organisms move in to the ecosystem. During the process of succession, producers typically enter a developing ecosystem before consumers. The producers modify the environment and makes it more suitable for the consumers.

(i had this on study island BTW)

the answer is a and have a great day