If We Model the History of the Earth as a Single

question 24

Multiple Choice

If we model the history of the Earth as a single day,at what time would the first human civilizations appear?

• A) 0.2 seconds before midnight
• B) 2 minutes before midnight
• C) 10:00 P.M.
• D) 6:00 P.M.

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Definitions:

Accumulated Degree Hours

A measurement unit for the thermal energy accumulated, used in forensic entomology to estimate the time since death based on insect development.

Chemiluminescence

The emission of light (luminescence) as the result of a chemical reaction without the need for external light sources.

Homogeneous Catalyst

A catalyst that exists in the same phase (solid, liquid, or gas) as the reactants in a chemical reaction, promoting the reaction without being consumed.

Zero-order Reaction

A chemical reaction where the speed at which it occurs is unaffected by the amount of reactant(s) present.