Hey there..
If I'm correct the guidelines are: reuse, reduce and recycle.
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Humans have higher brain functions
Answer: warm front
Explanation: When a warm air mass meets a cold air mass, the warm air rises since it is lighter. At high altitude it cools, and the water vapor it contains condenses. This type of front is called a warm front. It generates nimbostratus clouds, which can result in moderate rain.
Answer:
C. Atomic Number
Explanation:
Atomic number, also known as proton number, never changes. Therefore it allows us to identify each atom.