a forest fire has wiped out 100 acres of woods. what will the pioneer species be as species start to move back in

The pioneer species will be small herbaceous plants, grasses.

Explanation:

Secondary succession can be described as the formation of an ecosystem after natural disastrous circumstances like fire or storm. These disasters might result in the complete removal of an ecosystem.

Initially, small plants grow in this area first like grass, shrubs or herbs. With the passage of time they grow and form the intermediate species. Animals also start to habitat this area again and eventually a climax community is formed again.