A species that plays a critical role in maintaining the structure of an ecological community and helps to determine the types and numbers of various other species in the community is known as
A. a keystone species.
B. the dominant species.
C. a predator.
D. the primary species.
E. the alpha species.
Answer: A
You might also like to view...
The half-life of Carbon-14 is approximately 5,700 years. Using this information scientists have been able to determine the age of some artifacts left by humans. A scientist wants to know approximately how old a piece of wood was that she found on the floor in an old cave that had recently been discovered. She removed the wood (with permission) to her laboratory. Her wood sample contained 2 grams
of Carbon-14 . If the age of the wood was determined to be 22,800 years old, how much Carbon-14 originally existed in this piece of wood? A. 32 grams B. 16 grams C. 12 grams D. 8 grams E. 4 grams
order of the phases of mitosis
What will be an ideal response?
A snake with stripes would be more likely to survive by fleeing predators in a straight line.
a. true b. false
Speciation often occurs when a habitat becomes more heterogeneous. In Lake Victoria different species of cichlids are found in different areas of the lake. The best explanation for this speciation is that
A) natural selection favored different heritable variations in different parts of the lake. B) male cichlids that lived in deep water needed to be seen by females, so they became colorful. C) food was scarce in the lake, so some fish had to learn how to scrape algae, some had to learn to eat insects, and some had to learn to bite leaves. D) humans selected for many different traits in cichlids in order to market them to the aquarium trade.