What is a probable reason why land species represent 86% of the world's species, whereas marine species only represent 14%?
a) There is more land on Earth than there is ocean.
b) Water slows down the evolutionary process.
c) The more variable the environment, the more chances there will be for new species to form, and the ocean is more stable than the land environment.
d) An underwater cataclysmic event during the Pleistocene killed many marine species, which reduced the previously abundant marine species count to less than the number of land species.
C
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Life has been sustained on the earth
A. for approximately six billion years. B. since the time of the last impact of the meteorite. C. through millions of years of ice ages and long warming periods. D. since the human species has been around. E. because of renewable resources.
For the same force, which cannon imparts greater speed to a cannonball?
A. A short-barreled cannon. B. A long barreled cannon. C. both the same D. none of the above
What is Earth's greatest distance from the sun?
a. apogee b. perigee c. aphelion d. perihelion e. periapsis
Earth's oceanic crust is considerably thicker than continental crust.
Answer the following statement true (T) or false (F)