Ans: D
Chemical changes:-
occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
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4 Compare the composition of the rock sample with other rock samples of know age
XYLEM AND PHLOEM.................
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Answer: Dr. Garcia should compare fly cells to human cells.
Answer:
rising into the atmosphere, cooling and changing into a liquid form.