Oxygen evaporates from the water
When the number of phytoplankton drastically decreased, this would affect the entire food web.
Phytoplankton are plankton consisting of microscopic plants. They are the autotrophic components of the plankton community and a key part of oceans, seas and freshwater basin ecosystems.
Answer:
mountain ranges. valleys. volcanoes. these can also cause earthquakes which will cause other things.
Explanation:
