Organic farming ________
A) is presently limited to crops of fruits and vegetables
B) began in the 1960s
C) has no national standards in the United States
D) and organically grown produce have not been supported by the European Union
E) has become more challenging because of contamination by GM crop varieties
E
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Light nuclei can be split. For example, a deuteron, which is a proton-neutron combination, can split into a separate proton and separate neutron. Does such a process yield energy or cost energy? Why?
A. Costs energy. This fact is consistent with the sum of the masses of the separated proton and neutron being greater than the mass of the original deuteron. B. Neither. The amount of energy required to split the light nuclei is exactly the same as that released. This is the basis of the Law of Conservation of Energy. C. Yields energy. This fact is consistent with the sum of the masses of the separated proton and neutron being less than the mass of the original deuteron. D. Yields energy. Splitting nuclei of any sort is a basic example of a nuclear reaction releasing massive amounts of energy.
Long-lived parent-daughter isotope pairs have half-lives of thousands to hundreds of thousands of
years. Indicate whether the statement is true or false.
The water level in a piezometer is a measure of:
a. atmospheric pressure b. hydraulic conductivity c. hydraulic gradient d. hydraulic head
Which non-Indigenous settlers dominated Canada into the 18th Century?
A) British B) Dutch C) French D) Irish E) American