An element is a pure substance that cannot be separated or divided into simpler substances by any method (physical or chemical). The four common elements in all the living organisms are carbon, oxygen, hydrogen, nitrogen.
Thus, the four elements that make up about 96 % of body matter are carbon, oxygen, hydrogen, nitrogen (c).
Ans
Neutralization reaction
Explanation:
The meaning is
acid + base = salt + water
Answer:
Because X-rays have wavelengths similar to the size of atoms
