Nearly 300 million years ago,dragonflies existed that were the size of large hawks today.Some scientists believe that these giants could fly then,but not today,because oxygen in the atmosphere was much higher.If oxygen levels 300 million years ago were 50% higher than today,what percentage of the atmosphere would have consisted of oxygen for these giant dragonflies?

Question

Quizplus · Accepted Answer

If oxygen levels were 50% higher than today, and today's oxygen level is approximately 20%, then 50% more would be 20% + 10% = 30%.

Nearly 300 Million Years Ago,dragonflies Existed That Were the Size