The ______ period is sometimes referred to as the age of fish

a. cambrian
b. permian
c. devonian
d. ediacaran
e. cretaceous


Ans: c. devonian

Biology & Microbiology

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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

Biology & Microbiology

DNA analysis of mitochondrial and nuclear DNA from the Y chromosome supports the __________

hypothesis of the origin of the species Homo sapiens. a. out of Africa b. Homo erectus c. multiregional d. multinational e. Asian focus

Biology & Microbiology

Describe an experiment in which transgenic mice were used to identify the male-determining region of the Y chromosome

What will be an ideal response?

Biology & Microbiology

A group of similar cells that perform a particular function is called.

a) an organ system b) an organ c) an organism d) a tissue

Biology & Microbiology