1 Which of the following statements apply both to enzymes and to any other catalysts?
a Their activity is stopped by high temperature.
b They speed up chemical reactions.
C They are proteins.
d They are not used up during the reaction.

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements