Within environmental science and biology, species protection employs diverse conservation techniques. A principal method involves relocating at-risk species from their native environments to dedicated facilities. This procedure encompasses:
This conservation strategy, based on these elements, is termed Biodiversity conservation. Its objective is to preserve and reinstate diverse life forms, ensuring their conservation occurs ex-situ, meaning beyond their natural habitats.
Study the pie chart given below, representing the global biodiversity and proportionate number of species of major taxa.

Answer the following questions:
[a] Identify 'X' and 'Y' in the given pie chart.
[b] Which one of the two 'X' or 'Y' is the most species-rich taxonomic group and by what percentage?
[c] Name the level of Biodiversity represented by the following: