Which is biotic?
wind
iron gate
sunlight
dead leaf

The answer is "dead leaf."

Explanation:

Although dead leaves are no longer alive, they were considered as once part of a living entity. Therefore, dead leaves are biotic factors. Wind, iron gates, and sunlight are not biotic components because they are the non-living parts of the environment that influence biotic factors. Hope this helps.

answer; i believe the correct answer is (replication is not conservative);