A species whose role in an ecosystem is vital to the abundance of other species in an ecosystem is called a(n)
A. indicator species.
B. native species.
C. keystone species.
D. specialist species.
E. nonnative species.
Answer: C
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The rain-shadow effect on the Isthmus is most pronounced
A) in the summer, on the Pacific side of the Isthmus. B) in the winter, on the Pacific side of the Isthmus. C) in the summer, on both sides of the coasts of the Isthmus. D) in the winter, on both sides of the coasts of the Isthmus.
On September 22, the length of daylight:
a. is at a maximum in the Southern Hemisphere. b. is at a minimum in the Southern Hemisphere. c. is equal in both the Northern and Southern Hemispheres. d. is typical for an autumn day everywhere on Earth.
Discuss the relationship between seawater density and water temperature
What will be an ideal response?
Comets are composed primarily of rocky and metallic materials.
Answer the following statement true (T) or false (F)