2
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Building Blocks of Life

Question 2 • AISD-Biology A CR - (25-26)

Which elements are common to all organisms? Check all that apply.sodiumoxygensulfurhydrogenironphosphorus

Answer
A
sodium
B
oxygen
C
sulfur
D
hydrogen
E
iron
F
phosphorus

Explanation

Oxygen, sulfur, hydrogen, and phosphorus are among the elements found in all organisms. They are part of important biological molecules: for example, hydrogen and oxygen occur in water, while phosphorus is in DNA and ATP, and sulfur occurs in some proteins. Sodium and iron are useful to many organisms, but they are not common to all.

AI-written and checked against the verified answer.

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