What is the likely source of methane in Mars atmosphere?
A. ongoing volcanic activity
B. Mars landings of exploration vehicles such as Spirit
C. the absorption of Phobos' (Mars' larger, inner moon) methane atmosphere through gravitation
D. the decomposition of the residue deposits left from Mars oceans
Answer: A
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If a country is experiencing a negative net migration rate, then
A) more people are leaving the country than moving to it. B) more people are moving to the country than leaving it. C) a negative net migration rate does not tell us anything. D) more people are dying in the country than are being born. E) the number of people leaving the country is equal to the number moving there.
The zone between the core and the crust is the:a
innersphere. b. lithosphere. c. mantle. d. convection center. e. molten zone.
Which of the following proteins is a hormone?
A) casein B) hemoglobin C) insulin D) all of these
The temperature at which condensation takes place is the ____
a. saturation point b. relative humidity c. dew point d. specific humidity