Marine reptiles, including turtles, sea snakes, marine lizards, and marine crocodiles, are equipped with special
____________ ____________ to concentrate and excrete excess salts from body fluids. Fill in the blank(s) with the appropriate word(s).
salt glands
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The multicelled fauna of the Neoproterozoic is known from all continents except Antarctica, and
is collectively referred to as the ______________. Fill in the blank(s) with the appropriate word(s).
China's Three Gorges Dam on the Yangtze and Vietnam's Nam Theun Dam on the Mekong demonstrate that
A) large hydroelectric projects can be carried out with little to no environmental impact and human displacement. B) hydroelectric installations cannot produce enough energy to compete with fossil fuel plants. C) the air pollution from the dams will have to be monitored constantly to protect human health. D) the major impacts on downstream communities will have to be carefully studied.
Which of the following channel characteristics adjusts in response to changes in energy of flow and sediment load in the channel?
A) channel slope B) channel width and depth C) both A and B D) none of the above - river channel form is controlled exclusively by the type of rock or sediment through which the river flows
Estimate the approximate length of daylight for the following locations:
a) Dawson, Yukon Territory, Canada (64° N), on December 21 b) Adelaide, South Australia (35° S), on June 21 c) Bangkok, Thailand (14° N), on March 20