Twenty two thousand so the answer is c
Answer: Coral reefs are important to the ecosystem because they are the pillars on which marine and coastal ecosystems are built. They keep plants, fish, and animals fed. They clean up our water and protect our coasts.
Explanation: Hope it helps :)
It is thigmotropism because it is not affected by gravity or light.
The soil located on top of a mountain differs essentially from lowland soils due to the process of their origin and their morphological and chemical characteristics.
