What is the total number of species predicted to live on Earth?
What will be an ideal response?
3 million and 11 million
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The lowest notch shown on this figure is 9 meters wide and 5 meters high from its base. The river has a velocity of 1 meter per second when it fills the notch. Based on the accompanying graph, what is the probability each year that the notch will be filled to the top?
A) 90% to 95%
B) 60% to 80%
C) 40% to 45%
D) Less than 40%
E) None of these are correct.
The vast majority of mammals belong to the ____ order
a. Monotremes b. Marsupials c. Placental d. hominids e. perissodactyls
American beavers, Castor canadensis, are widespread in North America. Those American beavers living around lakes in northern Minnesota and that can potentially interbreed
A) are probably another beaver species. B) represent one population of American beavers. C) likely look much different than beavers in Wisconsin. D) belong to the same family but not the same genus as other beavers.
The two types of glaciers are
A. continental and marine. B. continental and polar. C. continental and alpine. D. alpine and marine.