P1: Wolves ate deer so less dear were in the
park to eat the trees. So the trees grew back.
P2: More trees grew so that meant more
birds and beavers came back to the park.
P3: The beavers Made the dams in the river.
The dams caused ducks, rats, fish and reptiles
to come back to the park.
P4: The river changed and became bigger
because the trees and plant roots helped
the river bank to stay which made the river
cleaner and bigger.
