Sea otters have been used as an example of the "Keystone Species" concept. This means that sea otters
A. exert a strong influence on the structure and functioning of their ecosystem.
B. are the base of the food chain in their ecosystem.
C. are the dominant species in their ecosystem.
D. have been recently introduced and are recruiting other new species to the ecosystem.
Answer: A
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The microbiome contains all
A) organisms present on the skin. B) organisms within the digestive system. C) organisms present in and on the body. D) organisms present on the skin and in the digestive system.
The nucleoli, found within the nucleus, are the sites of ____ synthesis
a. chromatin b. mRNA c. ribosomal subunit d. gene e. protein
Some bacteria have a cytoskeleton of sterols to help maintain their shape.
Answer the following statement true (T) or false (F)
The fossil record used to support evolution is not complete. In fact, large gaps exist in the fossil record. As a result, the evolution of a species cannot be completely traced in many cases. What is one reason why the fossil record is incomplete?
A) Fossils can form only from the remains of complex organisms. B) Many species lived in environments that did not favor fossil formation. C) The fossil record only contains the fossils of land organisms. D) Fossils can survive only for 10,000 years.