_____ occupy more than 2/3 of Global Biodiversity.

The correct answer is Option (2) → Animals

Option (2) Animals — Correct. Of all the species recorded on earth, more than 70 per cent are animals; plants (including algae, fungi, bryophytes, gymnosperms and angiosperms) make up no more than 22 per cent. So animals form more than two-thirds of global biodiversity.

Option (3) Algae — Incorrect. Algae are part of the plants, which are no more than 22 per cent.

NCERT Extract:
Biodiversity – “… Let us look at some interesting aspects about earth’s biodiversity based on the currently available species inventories. More than 70 per cent of all the species recorded are animals, while plants (including algae, fungi, bryophytes, gymnosperms and angiosperms) comprise no more than 22 per cent of the total. Among animals, insects are the most species-rich taxonomic group, making up more than 70 per cent of the total. That means, out of every 10 animals on this planet, 7 are insects.”