The center of our galaxy lies in the direction of (but far beyond) the stars in the constellation of
a. Ursa Minor.
b. Ursa Major.
c. Sagittarius.
d. Orion.
e. Monoceros.
c
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What natural barrier tries to prevent two protons from combining?
A) Dark energy B) Antigravity C) Electromagnetic repulsion D) The weak nuclear force E) The strong nuclear force
Which of the following observations is consistent with the hypothesis that all life on Earth has a common ancestor?
A) different organisms use the same set of amino acids B) different organisms use different sets of amino acids C) all proteins are made of amino acids D) some organisms don't use amino acids at all
Microfossils are
A) fossilized microbes B) the remains of very small dinosaurs C) the remains of the very first multicellular organisms D) the remains of the tiny organisms which were first to colonize onto land
When an object is 12 cm in front of a concave spherical mirror, the image is formed 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 15 cm B) 4.0 cm C) 2.4 cm D) 1.3 cm