Biodiversity true or false?

1) Relationships between different species are very important.
2) An environment with 2 million corn plants is more biodiverse than one with 100 corn plants, 25 butterflies, and several other animals.
3) Biodiversity refers to the variety of life in an ecosystem.
4) High biodiversity helps to ensure resilience and stability. In other words, ecosystems with high biodiversity are usually healthier.