A)secrete colourful pigments to attract mates.
B)host symbionts with colourful photosynthetic pigments.
C)build their skeletons from colourful minerals.
D)secrete colourful pigments to protect themselves from ultraviolet light.

A)contain different species of algal symbionts compared to tropical water corals.
B)do not harbor algal symbionts due to lack of light.
C)grow slowly due to cold temperatures.
D)are not negatively impacted by fishing because they are not in tropical waters.
E)B and C

A)Hydrozoa
B)Scyphozoa
C)Anthozoa
D)Cubozoa