The answer to this question is B.
Answer:
12. A
13. A
Explanation:
12. A chemical reaction occurs when something new is transformed and changed chemically. The other answer choices, B, C, and D are physical changes; nothing new is really being created.
13. When water is heated to become a gas, that term is called boiling. Hence the name, <em>boiling point. </em>
Answer:
The sense organs contain groups of specialised cells called receptor cells which produce electrical impulses in response to specific stimuli.
Explanation:
In the 1950s, the discovery of molecular structure of DNA revolutionized biotechnology.
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