How are the Earth's crust and humans the most similar according to these graphs? a The largest percentage of both is oxygen. b S
ilicon is rarely found in nature. c Chemical reactions occur with similar frequency in humans and the Earth's crust. d The smallest percentage of both is potassium.
Answer: Option (a) is the correct option that is largest percentage of oxygen is present in both earth's crust and human body.
Explanation: Oxygen is present in large amounts both in earth's crust and human body. The percentage of oxygen in earth's crust is 46.6% and the percentage of oxygen in the body is about 66.6%. So it is concluded that both human body and earth's crust have high percentage of oxygen.
When H+ concentration is lower than OH- concentration, the solution is basic or alkaline, and the pH of the solution is indicated with a number above 7
