Answer:
a bicyclist travels 60.0 kilometers in 3.5 hours what is the bicyclist average speed?
Average speed= 4.76m/s
Explanation:
Speed= distance/time
distance= 60km= 60 X 1000= 60,000m
time= 3.5 hours= 60 X 3.5= 210 minutes= 210 X 60= 12600 seconds
Therefore speed= 60000m/12600s
Speed= 4.76m/s
Answer:
Increased oxygen concentration
Explanation:
The evolution of O2-producing cyanobacteria that use water as terminal reductant transformed Earth's atmosphere to one suitable for the evolution of aerobic metabolism and complex life. The innovation of water oxidation freed photosynthesis to invade new environments and visibly changed the face of the Earth.
The oxygen atom of H2O has a negative charge.