What is an indication that human activities have altered the natural nitrogen cycle?
A. explosive growths of algae
B. explosive growths of sea bass
C. explosive growths of canaries
D. explosive growths of poison ivy
Answer: A
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Pangaea was
A) a supercontinent centered on present-day Africa. B) an area of active earthquakes and volcanoes. C) an area of colliding plates that formed the Himalaya Mountains. D) the divergent plate that created the Rocky Mountains in North America. E) a deep ocean trench created by colliding plates.
The mining company operations in the forest will likely lead to the loss of ecosystem services, such as
A) falling market value for iron products. B) increased costs of clothing and equipment. C) sources of freshwater and biodiversity of food sources. D) the construction of new roads.
What physically breaks hydrogen bonds between water molecules as ice melts?
-covalent bonds of water molecules -movement of water molecules -mass of water molecules -polarity of water molecules
Judge the following sentence according to the criteria given below: Schooling may help fish swim greater distances than individuals BECAUSE each schooling fish gets a boost from the vortex created by the fish swimming in front of it
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.