Final answer:
Two phrases that help determine the meaning of biodiversity in the context of sea life are regarding the crucial role of biodiversity data in protecting marine environments and how technology enables non-destructive research, underscoring the ecological importance of species richness and relative species abundance.
Step-by-step explanation:
To determine the meaning of biodiversity within the context of sea life as discussed in the excerpt, two phrases that help are 'crucial biodiversity data to support the protection of fragile underwater rocky habitat' and 'precision of ROV technology, collection for scientific study is non-destructive to the surrounding habitat'.
The first phrase illustrates that biodiversity data is critical in upholding the integrity of marine environments, highlighting that biodiversity refers to the variety of life and its ecological importance. The second phrase showcases how technology enables the study of this variety without harming it, emphasizing the value placed on maintaining species richness and relative species abundance in these ecosystems.