Which of the following provides evidence that all life on Earth shares a common ancestor?
A) All life on Earth shares certain biochemical similarities, including use of DNA as its hereditary molecule.
B) All life on Earth requires energy and nutrients to survive.
C) All life on Earth requires liquid water to survive.
D) All life on Earth shares similarities in appearance that could not possibly be a coincidence.
A) All life on Earth shares certain biochemical similarities, including use of DNA as its hereditary molecule.
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In modern Miller—Urey experiments it is assumed that carbon and nitrogen in the early atmosphere were present as
A) methane (CH4 ) and ammonia (NH3) B) carbon dioxide (CO2 ) and nitrogen (N2) C) carbonates (CO3-) and nitrates (NO3-) D) carbon and nitrogen atoms
The Moon is about one-quarter the diameter of Earth. How does its mass compare?
A. The Moon is 1/81 as massive as Earth. B. The Moon is 1/4 as massive as Earth. C. The Moon is 1/6 as massive as Earth. D. The Moon is 1/32 as massive as Earth.
An astronaut is piloting a spacecraft, which is in a circular orbit around Earth. A space station is ahead, on the same circular orbit. If he fires his rockets briefly to decrease the forward speed of the rocket, what will happen?
What will be an ideal response?
A tube of mercury with resistivity 9.84 × 10-7 ? ? m has a uniform electric field of 23 N/C inside the mercury. What is the current through the tube, if the radius of the tube is 0.495 mm?
A) 18 A B) 180 A C) 29 A D) 280 A