Answer:
ecosystem
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Answer:
C. Energy is absorbed and released during chemical reactions,
Explanation:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy.
The answer is d. calcium silicide is added to liquid steel to increase the steel's ability to freeze
The answer is 18.02 grams