During ecological succession, a pioneer community gradually transitions through several seral stages before reaching a stable climax community.

Which of the following statements about these changes are correct?

1. Food webs become increasingly complex, leading to greater ecosystem stability as alternative trophic pathways are established.
2. Interspecific competition increases because the abiotic environment becomes less hostile, allowing more species to colonise.
3. The dominant plant species of the climax community modify the environment in a way that makes it less suitable for their own offspring, driving further successional changes.