1. Which statement about biodiversity in coral reefs is accurate?
A. most organisms that live in coral reef habitats are zooxanthellae
B. Coral reefs have much biodiversity, but most species that live there migrated from other habitats
C. More new species have evolved in coral reef habitats than in most other types of habitats
D. Species that evolved in coral reef habitats always stay in those habitats
2. Which of the following triggered large scale growth of coral reefs millions of years ago?
A. the relationship between coral and zooxanthellae
B. the effects of tsunamis on marine life
C. the evolution of new species of fishes
D. the extinction of some species of algae