Intermolecular hydrogen bonds
Answer:
The answers is D option why because when he jumps and goes down with a force and opens parachute so lesser force with his acceleration
In secondary succession, the pioneer species are plants that are adapted to exploit disturbances rather than bare rock. They typically include plants such as grasses, birch trees, and fireweed. Organic matter from the pioneer species improves the soil so other trees and plants can move into the area.
