Venus's Flower Basket
The correct answer is b) sponge resembling a flower basket.

Overview
Venus's flower basket is a unique deep-sea sponge that belongs to the class Hexactinellida. It is known for its intricate mesh-like structure that resembles a delicate flower basket.

Physical Characteristics
- Venus's flower basket has a cylindrical shape with a lattice-like skeleton made of silica.
- The sponge is usually white or light grey in color.
- It can grow up to several feet in length.

Habitat
- These sponges are typically found in deep-sea habitats, often at depths of 1000 meters or more.
- Venus's flower basket is commonly found in the Pacific Ocean, particularly off the coast of Japan and the Philippines.

Symbiotic Relationship
- Venus's flower basket forms a symbiotic relationship with a species of shrimp known as the Venus's flower basket shrimp (Euplectella aspergillum).
- The shrimp live inside the sponge and feed on particles that the sponge captures.

Significance
- Venus's flower basket is not only a fascinating deep-sea creature but also has cultural significance in some Asian countries.
- In Japan, these sponges are sometimes given as wedding gifts because they symbolize eternal love and fidelity due to the presence of the shrimp pair living inside.
In conclusion, Venus's flower basket is a sponge species with a distinctive appearance resembling a flower basket. Its intricate structure, deep-sea habitat, and symbiotic relationship with the Venus's flower basket shrimp make it a fascinating and unique marine organism.