NCERT Important Questions Class 9 Science biology Chapter 7
Important NCERT Extra Questions
Chapter 7 Diversity in Living Organisms
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
What is the skeleton of sponges made up of?
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Skeleton of sponges is made of spicules or spongin fibres. Spicules are formed of calcium carbonate and silica.