What is the importance of the photic zone in aquatic habitats?
a. Oxygen levels are very low in the photic zone, often resulting in mass mortalities.
b. Only plants can thrive in the photic zone.
c. Habitats that have a large photic zone are more likely to have a high level of nutrients
d. Predation is lowest in the photic zone
e. The photic zone is where most primary production occurs
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Which set of Latin American nations were most successful in attracting European immigrants between 1870 and 1930?
A) Argentina, Chile and Uruguay B) Colombia, Venezuela and Ecuador C) Ecuador, Peru and Bolivia D) Costa Rica, Panama and Colombia E) Guatemala, El Salvador and Nicaragua
Compared to gravitation between a newborn baby close to its mother and gravitation of the baby to Planet Mars, gravitation is greater toward
A. Mars. B. Mom. C. about the same. D. not possible to say
Describe how the carbon-14 dating technique works. What will be an ideal response?
What role can energy conservation play in combating global warming?
What will be an ideal response?