The colonization of life onto land was closely tied to the
A) appearance of multicellular organisms
B) development of photosynthesis
C) oceans being overcrowded
D) development of the ozone layer
D
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Earth is closest to the Sun during the month of January. Explain then why we do not experience our hottest weather in January in the northern hemisphere
What will be an ideal response?
The last page of a book is numbered 764. The book is 3.0 cm thick, not including its covers. What is the average thickness (in centimeters) of a page in the book, rounded to the proper number of significant figures?
A) 0.0039 cm B) 0.072 cm C) 0.0079 cm D) 0.00393 cm E) 0.00785 cm
Consider a uniform electric field of 50. N/C directed toward the East. If the voltage measured relative to ground at a given point in the field is 80. V, what is the voltage at a point 1.0 m directly East of the point?
A) 15. V B) 30. V C) 0.15 kV D) 30. kV E) impossible to calculate from the information given
Which of the following hypothetical observations would contradict our theories about the formation and evolution of white dwarfs?
A) discovery of a white dwarf with a surface temperature of 6000 K B) discovery of a white dwarf with a 1.5 Msun mass main-sequence companion C) discovery of a white dwarf with a mass 1.5 times that of the Sun (1.5 Msun) D) discovery of a white dwarf at the center of a planetary nebula