What organism is most likely responsible for first producing oxygen in earths early atmosphere? How did the work of J. William Schopf help demonstrate this theory?

Which event would lead to primary succession of a forest?

Some tools have graduations to show multiple measurements. for example, a ruler may have graduations for both millimeters and centimeters. when measuring the length of an earthworm, which graduations would allow for the most accurate measurement? millimeters centimeters decimeters meters

In each transformation of energy , some energy what?