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Most animal cell membranes have proteins that pump ______ ions out of the cell and potassium ions into the cell. A) calcium B) carbon C) magnesium D) sodium
answered
Jan 15, 2018
Biology
middle-school
6
votes
67.0k
views
How long do students have to complete the english section of the aspire test? a.) 20 b.)15 c.)65 d.)40
answered
Oct 4, 2017
English
high-school
1
vote
166k
views
The wavelength of a light wave can be used to measure which of the following? A: How many photons the wave contains B: How high the top of the wave is C:How much energy the wave has D:The direction the
answered
May 11, 2017
Chemistry
high-school
5
votes
226k
views
Two asteroids are 50,000 m apart. one has a mass of 5 x 10^8 kg. If the force of gravity between them is 8.67 x 10 ^ -2 N, what is the mass of the other asteroid?
answered
Mar 29, 2017
Physics
high-school
3
votes
99.6k
views
Jessica is playing a game with the two spinners shown below. She will win the game if the product of the two spinners is an even number greater than twelve. What are all of the possible outcomes in which
answered
Mar 5, 2017
Mathematics
middle-school
4
votes
66.9k
views
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