The trace metal iron is required for photosynthesis and nitrogen fixing enzymes
Indicate whether the statement is true or false
True
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Zebra mussels have been successful invasive species in the Great Lakes because they
A. can survive in dam rivers, which restrict natural river flow. B. have no natural enemies. C. destroy wetlands. D. arrived in the ballast water of a European ship. E. suck the blood out of almost any kind of fish.
Which condition is necessary for a planet to have a permanent liquid ocean?
a. low gravity b. double sun c. toxic atmosphere d. irregular orbits e. optimum distance from star
During the summer season, the subtropical high found in the North Atlantic is also called the:
A) Atlantic high. B) Carolina high. C) Bermuda high. D) Azores high.
Shales are well cemented because of the high number of pore spaces
Indicate whether this statement is true or false.