Directions: A paragraph is given below which contains one or more errors in it. Read the paragraph carefully, find out how many errors are there in the paragraph and mark it as your answer.

"The exploration of deep-sea ecosystems have uncovered a wealth of biodiversity. The adaptations of organisms to extreme pressures and temperatures are remarkable. Furthermore, the discovery of hydrothermal vents have revealed unique chemosynthetic communities. The long term effects of deep sea mining are unknown."