Which of the following is the correct explanation of the word, 'Corals'?

Question

Answer 1

Corals are marine invertebrates in the class Anthozoa of phylum Cnidaria.

They typically live in compact colonies of many identical individual polyps.

Coral, a sessile animal, relies on its relationship with plant-like algae to build the largest structures of biological origin on Earth.

Answer 2

Corals are marine invertebrates in the class Anthozoa of phylum Cnidaria.
They typically live in compact colonies of many identical individual polyps.
Coral, a sessile animal, relies on its relationship with plant-like algae to build the largest structures of biological origin on Earth.