Which of the following are primary messengers?
A) prostaglandins
B) steroid hormones
C) thromboxanes
D) all of these
B
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A diesel locomotive of mass 4m coasting at 10 km/h collides inelastically with a stationary flatcar of mass m. The speed of the locomotive-flatcar combination when stuck together is
A. 8 km/h. B. 4 km/h. C. more than 8 km/h. D. 6 km/h.
ANS: C
The life history of a star is based on its initial mass. Stars convert hydrogen atoms into larger carbon and oxygen atoms. Once the star begins to consume the carbon and oxygen it produced, it increases its energy output. The rate of this is determined by temperature and size. Information can be found in the section Stars and Seas
Summarize the recent changes in the Arctic and Antarctic regions as a result of climate change
What will be an ideal response?
Which of the following represents multinational corporations and has the authority to impose financial penalties on nations that do not comply with its directives?
a. The EPA b. The EU c. The World Bank d. The WTO