Answer:How it indicates the health of the environment is when the less food, shelter, and mates cause population reduction and if nothing done to stop (or reduce) the amount of thing being taken away they could go extincted.
Explanation: Read above /\
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Air bubbles, which make them porous
Answer:
hair is a physical change.
Cooking is a physical and chemical change.
Ice cream melting in the sun is a physical change.
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The answer is SiO2 is Nonpolar.
Reactivity. It is the ability of matter to combine chemically with other substances.
