Answer:
A
Explanation:
see africa (poor), india (kind of poor), china (little bit poor) v US (rich), Britian (also rich), western Europe (EU is rich)
Enzymes catalyze reactions by decreasing the activation energy of a reaction.
A catalyst is a material that speeds up a chemical reaction without really being a reactant. Enzymes are the biological catalysts that drive biochemical reactions in living things. Most enzymes are proteins, however certain ribonucleic acid (RNA) molecules can also function as enzymes. Enzymes play a crucial role in reducing a reaction's activation energy, or the amount of energy required for the reaction to start.
Enzymes function by attaching to reactant molecules and holding them so that chemical bond-forming and bond-breaking reactions proceed more quickly. An enzyme will attach itself to one or more reactant molecules and start the process by catalyzing it. These compounds are the substrates for the enzyme. One substrate may undergo several product breakdowns in various reactions.
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Answer: From their food.
Explanation: They convert the food they eat into energy which helps them generate heat.
ANSWER: C: HOW MANY PLANETS THERE ARE
EXPLANATION: A model cannot show accurate weight. The Sun doesn't spin, and the Solar System cannot be accurately measured in a model