Answer:
Adaptation is process which runs parallel to an evolution
Primary succession occurs when there are no remains of the previous ecosystem.
Secondary succession occurs when there are still remains of the ecosystem, so secondary succession kind of has a head start.
Frogs are insectivores. If the frogs prey on the gnats and their numbers are decreased, this allows the gnats to proliferate because the competition for survival is lessened. Gnats, being lower on the food chain, have adapted to lay large numbers of eggs due to the environmental pressures under which they evolved (being eaten in large quantities). Therefore, fewer gnats being eaten = more gnats surviving.
