According to findings from the Kepler telescope, the estimated number of planets in the Milky Way is ________with some ________ in habitable zones
A) 50 billion; 500 million
B) 1 billion; 25 million
C) 25 million; 3 million
D) 300 billion; 125 billion
A
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Water, H2O, and methane, CH4 have about the same mass and differ by only one type of atom. Why is the boiling point of water so much higher than that of methane?
A) The water molecule is less symmetrical than is the methane molecule. B) The oxygen of a water molecule has two lone pairs of electrons. C) The electronegativity difference between oxygen and hydrogen is greater than the electronegativity difference between carbon and hydrogen. D) all of the above
Emissivity
A) can have values greater than one. B) will always be less than one for any object that is not a black body. C) is typically .1 or below for most natural surfaces encountered on Earth. D) is constant for the atmosphere.
The major plant nutrient most likely to be a limiting factor is
a. Phosphorous b. Calcium c. Nitrogen d. Potassium e. Carbon
Dolphins and porpoises are small-toothed whales.
Answer the following statement true (T) or false (F)