The correct answer should be D. can be real or virtual depending on the object's placement
Depending on the position on the mirror, it can be determined whether the object is real or virtual.
the most important methods are A and B
Answer: the correct answer is a.
Explanation: a spreading of the sea floor is the correct answer.
<span>Statement A is wrong because all atoms has protons and neutrons in the neucleus except for hydrogen that has only one proton in the neuclues. Statement B is also wrong. Statement C is correct as there exists isotopes which are atoms of the same element wich exist with different number of neutrons.</span>
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