C Time of year I just took the quiz.
Answer:
chemical reactions.
Explanation:
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.
Answer:
As heated material gets closer to the surface, it begins to cool
Explanation:
The core and surface have very different temperatures where the core is extremely hot as compared to the surface. When mantle gets heated as it passes near the core, it rises towards the surface. When it reaches the surface, it begins to cool and becomes more dense. The cooled magma then starts to sink down back near the core where it gets heated again and rises. This is what drives convection currents.
Heyy!
Your answer is A because Genes are functional unit of DNA, usually a segment of DNA in chromosome.
to sum it up Your answer Is A
Hope this helps!!