Reptiles, including birds, belong to one major lineage of amniotes, and _____ belong to another
a. sharks c. mammals
b. frogs and toads d. slamanders
C
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Viroids characteristically are composed of
A. ssRNA. B. dsRNA. C. ssDNA. D. dsDNA.
The science of ____ explains the origin and persistence of life, and studies the changes in living things
a. nanotechnology b. biology c. pharmacology d. mathematics e. chemistry
Sumatra is home to one species of orangutan, a species of critically endangered elephant, and the Sumatran tiger, but half of Sumatra’s forest is now gone. The neighboring island of Borneo, home to the other species of orangutan, has lost a similar area of forest. Forest loss continues in protected areas of Borneo. All three species of orangutan are now listed as endangered by the International Union for Conservation of Nature (IUCN), but they are simply the most visible of thousands of species that will not survive the disappearance of the forests in Sumatra and Borneo. This is an example of which type of threat to biodiversity?
a. introduction of exotic species b. global climate change c. habitat loss d. overharvesting
One double-stranded DNA molecule combined with proteins form ____________________, which is visible as
clumps or threads in the cell nucleus. Fill in the blank(s) with the appropriate word(s).