Which of the following is true of the origin of life on Earth?
A) Evidence suggests that the earliest living things contained hard bones and shells.
B) The oldest living fossils indicate that life began on land.
C) Evidence suggests that the earliest living things were multicellular and gigantic.
D) The oldest fossils indicate that life began in the sea.
D
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Bricks have been made for centuries by baking them in direct sunlight. Determine the time required to complete the baking if water is driven off at 95ºF and it requires 7000 Btu for each brick. Each brick is 4 inches by 6 inches by 8 inches and the surface emissivity is 0.4.
What will be an ideal response?
Which of the following is true of active galaxies?
A) They are often distorted. B) They do not have a black hole. C) They do not have an accretion disk. D) They are much larger than many galaxies.
The two forms of electromagnetic (E-M) radiation that experience the least atmospheric opacity are
A) visible light and infrared waves. B) X and gamma radiation. C) microwaves and radio waves. D) ultraviolet and infrared waves. E) visible light and radio waves.
Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?
a. The greater mass hits the ground first. b. Both objects hit the ground at the same time. c. The smaller mass hits the ground first. d. No conclusion can be made with the information given.