Why is the chemical evolution model preferred by scientists over other theories for the origin of life on Earth?
A) it is the theory that best fits the available data
B) because we have been able to create Life in the laboratory
C) because it was written down in ancient scriptures
D) because the other theories have been shown to be incorrect
A
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An electron moves in a region where the magnetic field is uniform, has a magnitude of 60 ?T, and points in the positive x direction. At t = 0 the electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path?
a. 4.7 mm b. 18 mm c. 3.8 mm d. 2.8 mm e. 5.7 mm
Earth's magnetic field is generated in the iron rich mantle
Indicate whether the statement is true or false
Components: The x component of vector 
is 8.7 units, and its y component is -6.5 units. The magnitude of 
is closest to
A. 9.9 units. B. 7.9 units. C. 8.9 units. D. 11 units. E. 12 units.
A hospital patient has been given some 131I (half-life = 8.04 d) which decays at 4.2 times the acceptable level for exposure to the general public
How long must the patient wait for the decay rate to reach the acceptable level? Assume that the material merely decays and is not excreted by the body. A) 17 d B) 12 d C) 8.0 d D) 7.2 d