PLEASE HELP ASAP Kelp play a substantial role in building the structure for kelp forests impacting species richness. Which statement best explains the role of kelp forests in maintaining the diversity of the ecosystems?

Kelp forest act as ecosystem engineers.
Kelp act as a keystone species.
Without the kelp forest as the producer, the feeding relationship would collapse.
With the presence of consumers, kelp is an invasive species.