One big advantage of the XRF measurement is that it does not destroy the sample.
a. true
b. false
a. true
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For each statement, indicate whether it is True or False. If you choose False, briefly explain why the statement is incorrect. True or false. Secondary consumers have more energy or power than do primary consumers
What will be an ideal response?
Actin filaments are approximately _______ in diameter.
a. 5 Å b. 7 nm c. 11 nm d. 25 nm e. 50 nm
The original atmosphere of Earth is thought to have been rich in
a. CO2, N2, H2, H2S, and CO. b. CO2, N2, O2, Ar, and Ne. c. CO2, N2, O2, Rn, and Ne. d. CO2, N2, H2, Kr, and Xe.
During the Snowball Earth temperatures at the equator rarely exceeded -20 degrees Celsius. Why didn't heat from the sun melt the ice?
A. The ozone layer absorbed all the heat. B. Ice reflected most of radiant energy. C. The earth's core was cooled and kept the ice frozen. D. The high levels of atmospheric moisture created extensive cloud cover.