Approximately how much of Earth's surface is water?
25%
5096
75%6
100%

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.