How are the earth's crust and humans the most similar according to these graphs? a the largest percentage of both is oxygen. b silicon 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.

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.

answer; ///(b) it is composed of four protein chains and four heme groups;

answer; i believe the answer is (polygenic inheritance;