Populations that were once considered separate species are sometimes reassigned to the same species because
A) they have evolved to look different from each other.
B) they have evolved to look the same.
C) they are no longer capable of interbreeding.
D) it was discovered that they can produce viable and fertile offspring.
E) they have been found to be genetically identical.
D
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The hantaviruses are occasionally spread by person-to-person transmission, although exposure to infected rodent excretia is the most common route of infection
Indicate whether the statement is true or false.
Which is usually true of archaea?
A. They are found as rods, spheres, or spirals. B. They reproduce by binary fission. C. They contain rigid cell walls. D. They are found as single cells. E. All of the choices are correct.
With almost no exceptions, the nitrogen fixers are
A. beans. B. green plants. C. insects. D. mammals. E. prokaryotes.
Unlike virtually all other eukaryotes, diplomonads lack mitochondria. Why aren't these organisms considered to represent a state most like the common ancestor to all other eukaryotes?
A. They have nonfunctional mitochondrial remnants. B. They are phototrophic. C. They do not use ATP to power their cells. D. They have endosymbiotic relationships with other bacteria.