Explain why salt marshes and estuaries are among the most productive of marine habitats
As the water is very shallow, there is plenty of light for photosynthesis (including vascular plants), and river flow brings a constant supply of nutrients. The gradient of salinity-from the fresh river water to the seawater-helps create a large number of niches.
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How long must a high-level nuclear waste facility be able to provide safe isolation?
a. 25 years b. 250 years c. 2,500 years d. 25,000 years e. 250,000 years
Which part of Southwest Asia and North Africa was the last to be converted to Islam?
A) Saudi Arabia B) Mesopotamia C) Northern Egypt D) Algeria E) Yemen
The Baltic languages of Latvian and Lithuanian are closely related to the Slavic languages
Indicate whether the statement is true or false
Living systems are considered
A) part of the lithosphere. B) inorganic. C) abiotic. D) biotic.