Approximately 40% of the energy used in a typical household is used for heating.
Answer the following statement true (T) or false (F)
True
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Multicelled organisms first appeared in the fossil record about 4.0 billion years ago
a. True b. False
The solution of calcite in a limestone supplies substantial amounts of ________ to ground water.
A. bicarbonate ions in solution B. an acid C. calcium ions in solution D. both calcium ions in solution and bicarbonate ions in solution E. All of the choices are correct.
A parcel of saturated air at 10°C with 10g water vapor/kg of air is heated to 20°C. Which of the following is true?
A. The air has 20 g water vapor/kg of air and is now saturated. B. The air has 10 g water vapor/kg of air and is still saturated. C. The air has 10 g water vapor/kg of air and is now unsaturated. D. The air has 20 g water vapor/kg of air and is now unsaturated.
A(n) ________ is another way in which a food chain can be conceptualized
A) sedimentary cycle B) open system C) food pyramid D) final link at the apex E) way of gaining energy at every step