Which of the following is an example of a keystone species?
A. wolves
B. sea kelp
C. bison
D. None of these are correct.
Answer: C
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Oxygen, O, (number 8), sulfur, S, (number 16), and selenium, Se, (number 34) have such similar chemical properties because
A. they all have the same number of occupied shells. B. their outermost shells contain the same number of electrons. C. they are all located close to one another in the periodic table. D. These elements can't have similar chemical properties because they are in different periods of the periodic table.
The infrastructure in most large American cities is currently in good shape, but will need major repairs or replacement in about 25 to 50 years
Indicate whether this statement is true or false.
Warm air ____ and cool air ____
A) expands and sinks; expands and rises B) contracts and rises; expands and sinks C) expands and rises; contracts and sinks D) expands and rises; expands and sinks
Many species are going extinct at a rate that is alarming scientists.
Answer the following statement true (T) or false (F)