B. An ecosystem in which plant roots are submerged during parts of the years
Answer:
Prehistoric
Explanation:
The Prehistoric Period—or when there was human life before records documented human activity—roughly dates from 2.5 million years ago to 1,200 B.C. It is generally categorized in three archaeological periods: the Stone Age, Bronze Age and Iron Age.
Answer:
As a result of photosynthesis oxygen and sugar
