Four elements, including ____, make up more than 96.5% of the mass of most living organisms.
A) sodium
B) potassium
C) phosphorus
D) nitrogen
E) calcium
Correct Answer:
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Q9: Q10: Carbon dioxide is an element. Q11: In the representation of hydrogen gas, H-H, Q12: The substance H2O is considered to be Q13: Acid precipitation can have a pH as Q15: Proteins in thermophiles must be stabilized by Q16: Buffers can increase the pH of a Q17: The substance O2is considered to be _. Q18: Diluted acetic acid, CH3COOH, is commonly called Q19: The polarity of water allows it to
A)
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