Identify the components of early Earth’s atmosphere, and explain how it changed to that of present day. What will be an ideal response?
Earth’s early atmosphere was rich in carbon dioxide, nitrogen, and water vapor, with traces
of ammonia and methane. This mixture was gradually altered by carbon dioxide dissolving in
seawater, the chemical breakup of water vapor by sunlight to form ozone, and photosynthesis
of green plants to form oxygen. Earth’s present atmosphere is composed primarily of
nitrogen and oxygen.
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Which community has the highest level of net primary production?
a. Rain forests b. Kelp forests c. Coral reefs d. Open ocean
Which of the following statements defies the first law of thermodynamics?
A) Autotrophs such as plants produce energy that is consumed by heterotrophs. B) When coal is burned in a power plant, some of the energy escapes as heat rather than being converted to electricity. C) When we build a campfire, the energy stored in the molecules in the wood is released as thermal energy. D) We can decrease the amount of entropy in our dorm room if we use energy to get things organized.
In grams of carbon per square meter per day, the open-ocean environment is as productive as a tropical rainforest.
Answer the following statement true (T) or false (F)
During the end Permian mass extinction, the die-offs were so extensive, ________ or more of animal species went extinct.
A. 47% B. 25% C. 80% D. 70%