Why is it difficult to find fossils representative of the time that life began on Earth?
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Fossils this old are difficult to recognize because the earliest living organisms did not contain easily preserved hard parts, like bones or shells, and because the ancient organisms were microscopic.
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When a microwave filter consisting of vertical parallel metal rods is in the absorbing position, oscillating currents are set up in the rods. At any one instant, the current in each rod has the same magnitude and direction. At that instant
a. the rods will try to move apart horizontally. b. the rods will try to move together horizontally. c. the rods will try to shift vertically upwards. d. the rods will try to shift vertically downwards. e. the rods will not be affected because the source of current is not a battery.
At temperatures below their boiling point, liquids gradually go into the gas phase through a process called
Blood as it enters the lungs has a high concentration of carbon dioxide and a low concentration of oxygen. The blood leaves the lungs with a high concentration of oxygen and a low concentration of carbon dioxide. What are the qualitative concentration gradients of CO2 and O2 in the lungs?
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What is Brewster's angle for light traveling in vacuum and reflecting off a piece of glass having a refractive index of 1.52?
A) 48.9° B) 33.3° C) 48.1° D) 56.7° E) 41.1°