Carbon,hydrogen,oxygen and nitrogen make up approximately what percentage of most living organisms?
A) 25%.
B) 50%
C) 75%
D) 80%
E) 96%.
Correct Answer:
Verified
Q7: The atomic number is the number of
A)
Q9: Which of the following is not part
Q10: All of the following are examples of
Q13: Which of the following statements is incorrect?
A)
Q15: Science
A) studies the past to predict the
Q16: Matter is anything that
A) has mass and
Q17: Forms of an element having the same
Q18: Which of the following is not an
Q19: Which of the following does not characterize
Q21: An example of potential energy is
A) electricity
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