A homogeneous mixture is not considered a pure substance because it can be separated through mechanical and thermal processes. A pure substance, however, cannot be separated.<span>
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Answer:
a. bubbles formed
Explanation:
Bubbles are a sign of gaseous molecules escaping, meaning that something has forced molecules to break apart and escape. A chemical reaction involves any change that directly impacts the molecular formation of a substance.
C is the answer c c c c c c c c c c c c c c c c c x c c x x x x x x x x x x x x x d c
. It can lead to changes in allele frequencies and the evolution oftraits.