Pleural Effusion! Hope this helps stay safe :)
To keep track of water levels and to help predict possible floods.
Oxygen is the by-product or waste product of photosynthesis. Plants do not make oxygen just for us.
Answer:
A climax community develops
The glacier retreated, leaving barren only rock
Lichen and other pioneer species grown on the rocks
Rock is broken down and converted into soil
Grasses and flowering plants grow in the soil
Shrubs and small trees grow in the soil
Small pine trees grow in the soil
Explanation:
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