Which elements are most abundant in living organisms?
A. oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus
B. carbon, potassium, iron, magnesium, hydrogen, and nitrogen
C. oxygen, calcium, phosphorus, sodium, hydrogen, and carbon
D. hydrogen, carbon, calcium, potassium, oxygen, and phosphorus
Answer:A
Which elements are most abundant in living organisms?
A. oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus B. carbon, potassium, iron, magnesium, hydrogen, and nitrogen C. oxygen, calcium, phosphorus, sodium, hydrogen, and carbon D. hydrogen, carbon, calcium, potassium, oxygen, and phosphorus